JPH0114908Y2 - - Google Patents
Info
- Publication number
- JPH0114908Y2 JPH0114908Y2 JP1983180781U JP18078183U JPH0114908Y2 JP H0114908 Y2 JPH0114908 Y2 JP H0114908Y2 JP 1983180781 U JP1983180781 U JP 1983180781U JP 18078183 U JP18078183 U JP 18078183U JP H0114908 Y2 JPH0114908 Y2 JP H0114908Y2
- Authority
- JP
- Japan
- Prior art keywords
- impactor
- test piece
- impact
- diameter
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案はセンサーを装着して破壊エネルギー等
破壊特性値を測定解析可能としたプラスチツク用
計装化衝撃試験機に関する。[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an instrumented impact testing machine for plastics that is equipped with a sensor and is capable of measuring and analyzing fracture characteristic values such as fracture energy.
（従来技術）
従来、プラスチツクの衝撃破壊強度を測定する
ための計装化衝撃試験機は、シエル状試験片等を
先端部が球状の衝撃子で打撃することによつて測
定を行つている。(Prior Art) Conventionally, an instrumented impact testing machine for measuring the impact breaking strength of plastics makes measurements by hitting a shell-shaped test piece or the like with an impactor having a spherical tip.
例えば、下方に平板状試験片を載置する支持台
を設け、その上方には、下方に衝撃子を設けた重
錘を案内杆に沿つて上下動可能に設け、支持台に
試験片を載置した後上方から重錘を落下させるこ
とによつて試験片を衝撃子で打撃せしめてセンサ
ーで衝撃力を測定する衝撃試験が行なわれてい
た。 For example, a support table on which a flat test piece is placed is provided below, a weight with an impactor attached below is provided above the support table so as to be movable up and down along a guide rod, and the test piece is placed on the support table. An impact test was conducted in which a weight was dropped from above after the test piece was placed, the test piece was struck by an impactor, and the impact force was measured using a sensor.
しかして、これ等衝撃試験機の衝撃子４は第２
図に示すように先端部４ａが半球状とされてい
る。 However, the impactor 4 of these impact testers is the second one.
As shown in the figure, the tip 4a has a hemispherical shape.
しかし、衝撃子４の先端部４ａが半球状である
と、衝撃子４の接触点と試験片支持台６の孔５の
周縁部との間隙が大きくなるため、衝撃子の落下
に伴なう試料の伸びの量が大きく、破壊応力曲線
は材料の伸び応力の影響が大きくなり、弾性率、
引張り伸び等の温度変化の大きい材料は正確な衝
撃試験評価が難しくなる。 However, if the tip 4a of the impactor 4 is hemispherical, the gap between the contact point of the impactor 4 and the periphery of the hole 5 of the test specimen support 6 becomes large, so that the drop of the impactor 4 is caused by a large gap. The amount of elongation of the sample is large, and the fracture stress curve is influenced by the elongation stress of the material, and the elastic modulus,
Accurate impact test evaluation becomes difficult for materials that undergo large temperature changes such as tensile elongation.
また、衝撃子４の押込み量によつて試験片７と
衝撃子４との接触面積が変化するため、破壊応力
曲線の解析も難しくなる欠点がある。 Furthermore, since the contact area between the test piece 7 and the impactor 4 changes depending on the amount of depression of the impactor 4, there is a drawback that analysis of the fracture stress curve becomes difficult.
（考案の概要）
本考案はかかる欠点に鑑てなされたもので、衝
撃子の接触面積変化、材料弾性率及び測定温度に
よつて局部的変形状態が変化することを避けるた
めに、応力集中させやすい形状の衝撃子を開発
し、本考案を成したものであつて、更に詳しく
は、衝撃力を測定するセンサーを有し縦方向の案
内杆に沿つて上下動可能な重錘の下部に垂設され
た衝撃子と、該重錘の下方に設けられ衝撃子が嵌
入可能な孔が穿設された支持台とからなり、前記
支持台に平板状プラスチツク試験片を載置し上方
から重錘を落下させてプラスチツク試験片を衝撃
子で打撃するようにした計装化衝撃試験機におい
て、
(a) 前記衝撃子は、打撃部中央部に凹陥部が形成
され、かつ、次の特性を有し、
(1) 衝撃子直径 ｄ≧６mm
(2) 打撃部のコーナ半径 r1≦0.25d
(3) 衝撃子断面真円度 ａ≦0.05d
(b) 前記支持台は、次の特性を有する。(Summary of the invention) The present invention was developed in view of the above drawbacks, and in order to avoid changes in the local deformation state due to changes in the contact area of the impactor, the elastic modulus of the material, and the measurement temperature, the present invention is designed to reduce stress concentration. The present invention was developed by developing an impactor with an easy-to-use shape. A flat plastic test piece is placed on the support base, and the weight is inserted from above. In an instrumented impact tester that strikes a plastic test piece with an impactor by dropping a (1) Impactor diameter d≧6mm (2) Corner radius of the striking part r 1 ≦0.25d (3) Impactor cross-sectional roundness a≦0.05d (b) The support base has the following characteristics. .
(1) ｄ＋2t＜ｓ≦ｄ＋8t
（ここで、ｓは試験片支持台の孔の直径、
ｄは衝撃子の直径、ｔは試験片の肉厚。単位
はmm）
ことを特徴とするプラスチツク用の計装化衝撃試
験機を提供するものである。 (1) d+2t<s≦d+8t (where s is the diameter of the hole in the specimen support,
d is the diameter of the impactor, and t is the wall thickness of the test piece. The present invention provides an instrumented impact testing machine for plastics, which is characterized in that the unit is mm).
（具体的説明） 以下図面に基づいて本考案を詳細に説明する。(Specific explanation) The present invention will be explained in detail below based on the drawings.
本考案計装化衝撃試験機１は、第１図に示すよ
うに、縦方向の案内杆２，２を有し、該案内杆
２，２に沿つて上下動可能な重錘３を有し、その
下部には衝撃子４が下方に向つて垂設されると共
に、その下方には、衝撃子４が嵌入可能な孔５が
穿設された試験片の支持台６が設けられており、
支持台６に平板状のプラスチツク試験片７を載置
し、上方から重錘３を落下させることによつて試
験片７を衝撃子４で打撃させて衝撃試験が行なわ
れ、重錘３に設けたセンサ８によつて衝撃力を測
定し、破壊エネルギ等が測定される。 As shown in FIG. 1, the instrumented impact testing machine 1 of the present invention has vertical guide rods 2, 2, and a weight 3 that can move up and down along the guide rods 2, 2. An impactor 4 is hung downwardly at the bottom thereof, and a test piece support 6 is provided below the test piece with a hole 5 into which the impactor 4 can be inserted.
A flat plastic test piece 7 is placed on a support stand 6, a weight 3 is dropped from above, and an impact test is performed by striking the test piece 7 with an impactor 4. The impact force is measured by the sensor 8, and the destructive energy and the like are measured.
本考案は、第３図、第４図に示すように打撃部
中央部に凹陥部が形成された衝撃子４を用いると
ころに特徴を有し、衝撃子４は断面が円形で、そ
の先端打撃部４ａの中央部には球面状あるいは円
筒状の凹陥部が凹設される。 The present invention is characterized in that it uses an impactor 4 in which a concave portion is formed in the center of the impacting part, as shown in FIGS. A spherical or cylindrical recess is provided in the center of the portion 4a.
また、衝撃子４の直径は６mm以上とされ、試験
片の厚さが１〜４mmの場合は６mm以上、好ましく
は８〜50mm、更に好ましくは10〜30mmとされる。
６mm以下の場合、試験片７との接触面積が小さ
く、従来の半球状の衝撃子の欠陥があらわれる。 Further, the diameter of the impactor 4 is set to 6 mm or more, and when the thickness of the test piece is 1 to 4 mm, the diameter is set to 6 mm or more, preferably 8 to 50 mm, and more preferably 10 to 30 mm.
If it is less than 6 mm, the contact area with the test piece 7 is small, and defects of the conventional hemispherical impactor appear.
また、打撃部円周４ｂのコーナ半径r1は、
0.25d以下が好ましく、0.05dが最適である。コー
ナ半径r1が0.25dより大きいときは、応力集中が
少なく精度が低下する。 Moreover, the corner radius r 1 of the striking part circumference 4b is
0.25d or less is preferable, and 0.05d is optimal. When the corner radius r 1 is larger than 0.25d, stress concentration is small and accuracy is degraded.
打撃部の真円度は、試験片の材料配向等の影響
を防ぐために0.05d以下であることが必要であり、
0.01d以内が好ましい。 The roundness of the striking part must be 0.05d or less to prevent the influence of the material orientation of the test piece, etc.
Preferably within 0.01d.
また、本考案は衝撃子４の直径に応じた寸法の
孔を有する試験片支持台が用いられ、試験片支持
台６の孔５の直径ｓは次のように設定される。 Further, in the present invention, a test piece support stand having a hole sized according to the diameter of the impactor 4 is used, and the diameter s of the hole 5 of the test piece support stand 6 is set as follows.
ｄ＋2t＜ｓ≦ｄ＋8t
（ここで、ｓは試験片支持台の孔の直径、ｄは
衝撃子の直径、ｔは試験片の肉厚。単位はmm）
また、試験片支持台孔５の径の設定は、製品デ
ザインに依存するので、あらかじめ検討する必要
があるが、上記条件を満していれば効果を得るこ
とができる。 d+2t<s≦d+8t (where, s is the diameter of the hole in the test piece support, d is the diameter of the impactor, and t is the wall thickness of the test piece. The unit is mm) Also, the diameter of the hole 5 in the test piece support The settings depend on the product design and must be considered in advance, but the effect can be obtained if the above conditions are met.
本考案は、衝撃子４の打撃部中央部に凹陥部が
形成されているため、衝撃応力は衝撃子４の周縁
部に集中し、せん断破壊をとり入れた測定がで
き、材料の伸び等の影響を防止することができ
る。 In the present invention, since a concave part is formed in the center of the striking part of the impactor 4, the impact stress is concentrated at the periphery of the impactor 4, and measurement that incorporates shear fracture is possible, and the influence of elongation of the material etc. can be prevented.
また、材料の伸びに伴なう材料と衝撃子との接
触面間の摩擦によるノイズを受ける心配もなく材
料の衝撃強度の評価を正確に行なうことができ
る。 Furthermore, the impact strength of the material can be accurately evaluated without worrying about noise caused by friction between the contact surface between the material and the impactor as the material stretches.
次に、本考案衝撃子を用いた場合の測定結果を
従来の衝撃子と比較して示す。 Next, measurement results using the impactor of the present invention will be shown in comparison with a conventional impactor.
実施例 １
ポリプロピレンシートＡ（三菱ノーブレンBC8、
密度0.90、MFR1.8ｇ／10分、三菱油化製）およ
びポリプロピレンシートＢ（三菱ノーブレン
BC5C、密度0.90、MFR2.8ｇ／10分、三菱油化
製）をそれぞれ、縦100mm、横100mm、厚さ２mmの
試験片とし、衝撃子先端部の形状が半球形状の衝
撃子（r1＝12.5mm、ｄ＝25mm）と第４図示の本考
案の衝撃子（r1＝1.5mm、ｄ＝20mm）を用いて衝
撃破壊エネルギーを求めた。Example 1 Polypropylene sheet A (Mitsubishi Noblen BC8,
Density 0.90, MFR 1.8g/10min, manufactured by Mitsubishi Yuka) and polypropylene sheet B (Mitsubishi Noblen)
BC5C, density 0.90, MFR 2.8 g/10 min, manufactured by Mitsubishi Yuka) were used as test specimens of 100 mm in length, 100 mm in width, and 2 mm in thickness . The impact fracture energy was determined using the impactor of the present invention (r 1 =1.5 mm, d = 20 mm) shown in Figure 4.
第５図イに、半球形状の衝撃子を用いた結果
を、第５図ロに、平面状の本考案衝撃子を用いた
例を示す。 FIG. 5A shows the results using a hemispherical impactor, and FIG. 5B shows an example using the planar impactor of the present invention.
第５図イからわかるように、従来の衝撃子は、
シートＡ、シートＢともに破壊エネルギーのピー
クをもち、破壊エネルギーの逆転現象が５℃付近
で起つている。破壊エネルギーのピークは局部的
変形領域が変化したために生じたものである。供
試材料を製品化した場合には大きな衝撃強度を有
するシートＡがシートＢよりも衝撃強度が小さく
評価される温度領域が出現しており、正しく評価
されていないことが判る。 As can be seen from Figure 5A, the conventional impactor is
Both Sheet A and Sheet B have a peak of fracture energy, and a reversal phenomenon of fracture energy occurs at around 5°C. The peak of fracture energy was caused by the change in the local deformation region. When the test material was commercialized, there appeared a temperature range in which Sheet A, which had a high impact strength, was evaluated to have a lower impact strength than Sheet B, and it was found that the evaluation was not accurate.
一方、第５図ロに示されるように、本考案衝撃
子は、破壊エネルギーピークが除去され、逆転現
象も存在せず、材料間及び測定温度間の衝撃強度
の有意差が忠実に評価されている。 On the other hand, as shown in Figure 5B, in the impactor of the present invention, the fracture energy peak is eliminated, there is no reversal phenomenon, and significant differences in impact strength between materials and measurement temperatures can be faithfully evaluated. There is.
上述したように、本考案の衝撃子を用いること
により、局部変形領域を一定にすることが可能で
あり、製品化した時の衝撃強度との対応が良く、
試験数を少なくできるなど多くの効果を得ること
ができる。また、試験片支持台の孔の径を選定す
ることによりせん断破壊が問題となる複雑な構造
体における衝撃強度を有効に評価することがで
き、計装化衝撃試験機の性能を大幅に向上させる
ことができる。 As mentioned above, by using the impactor of the present invention, it is possible to keep the local deformation area constant, and it corresponds well to the impact strength when commercialized.
Many benefits can be obtained, such as reducing the number of tests. In addition, by selecting the diameter of the hole in the test specimen support, it is possible to effectively evaluate the impact strength of complex structures where shear failure is a problem, greatly improving the performance of instrumented impact testing machines. be able to.
第１図は本考案衝撃試験機の側面図、第２図は
従来の衝撃子の側面図、第３図イは本考案に用い
られる衝撃子の縦断面図、ロは同衝撃子の下底面
図、第４図イは本考案に用いられる衝撃子の他の
例を示す縦断面図、ロはその下底面図、第５図
イ，ロは、従来の衝撃子と本考案衝撃子で測定し
た結果を示図、第６図イ，ロは従来の衝撃子と本
考案衝撃子で測定したときの夫々の応力波型を示
す図である。
１……衝撃試験機本体、４……衝撃子、４ａ…
…衝撃子先端部。
Figure 1 is a side view of the impact tester of the present invention, Figure 2 is a side view of a conventional impactor, Figure 3A is a vertical sectional view of the impactor used in the invention, and B is the bottom surface of the same impactor. Figure 4A is a vertical cross-sectional view showing another example of the impactor used in the present invention, Figure 4A is a bottom view thereof, and Figures 5A and 5B are measurements of the conventional impactor and the impactor of the present invention. The results are shown in Figures 6A and 6B, which show the stress waveforms measured with the conventional impactor and the impactor of the present invention, respectively. 1...Impact tester main body, 4...Impactor, 4a...
...Impactor tip.
Claims (1)
杆に沿つて上下動可能な重錘の下部に垂設された
衝撃子と、該重錘の下方に設けられ衝撃子が嵌入
可能な孔が穿設された支持台とからなり、前記支
持台に平板状プラスチツク試験片を載置し上方か
ら重錘を落下させてプラスチツク試験片を衝撃子
で打撃するようにした計装化衝撃試験機におい
て、 (a) 前記衝撃子は、打撃部中央部に凹陥部が形成
され、かつ、次の特性を有し、 (1) 衝撃子直径 ｄ≧６mm (2) 打撃部のコーナ半径 r1≦0.25d (3) 衝撃子断面真円度 ａ≦0.05d (b) 前記支持台は、次の特性を有する (1) ｄ＋2t＜ｓ≦ｄ＋8t （ここで、ｓは試験片支持台の孔の直径、
ｄは衝撃子の直径、ｔは試験片の肉厚。単位
はmm） ことを特徴とするプラスチツク用の計装化衝撃試
験機。[Claims for Utility Model Registration] An impactor installed vertically at the bottom of a weight having a sensor for measuring impact force and movable up and down along a vertical guide rod, and an impactor installed below the weight. A flat plastic test piece is placed on the support stand and a weight is dropped from above to strike the plastic test piece with the impactor. In the instrumented impact tester, (a) the impactor has a concave part formed in the center of the impact part, and has the following characteristics: (1) impactor diameter d≧6mm; (2) impact Corner radius r 1 ≦0.25d (3) Impactor cross-sectional roundness a≦0.05d (b) The support base has the following characteristics (1) d+2t<s≦d+8t (where s is the test The diameter of the hole in the single support base,
d is the diameter of the impactor, and t is the wall thickness of the test piece. This is an instrumented impact testing machine for plastics, characterized in that the unit is mm).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18078183U JPS6088256U (en) | 1983-11-22 | 1983-11-22 | Instrumented impact tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18078183U JPS6088256U (en) | 1983-11-22 | 1983-11-22 | Instrumented impact tester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6088256U JPS6088256U (en) | 1985-06-17 |
| JPH0114908Y2 true JPH0114908Y2 (en) | 1989-05-02 |
Family
ID=30391896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18078183U Granted JPS6088256U (en) | 1983-11-22 | 1983-11-22 | Instrumented impact tester |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6088256U (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52101484U (en) * | 1976-01-29 | 1977-08-01 | ||
| JPS5654057Y2 (en) * | 1977-06-29 | 1981-12-16 | ||
| JPS6018932B2 (en) * | 1978-09-14 | 1985-05-13 | 住友金属工業株式会社 | Steel pipe impact test equipment |
-
1983
- 1983-11-22 JP JP18078183U patent/JPS6088256U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6088256U (en) | 1985-06-17 |
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