Abstract This paper presents a modified pendulum hammer adapted to test the impact strength of lap joints. The impact tests of lap specimens exhibited greater repeatability in terms of the results, compared with the tests of block specimens (specimens used in Block Shear Test (ISO 9653)). The modified testing device also allowed for testing of rivet and hybrid rivet–adhesive joints. The comparative tests showed that the impact strength of the hybrid connections was greater than the sum of the impact strengths of the adhesive and rivet joints. Our research demonstrated the significant effect of the impact speed on the measured impact strength; this effect appeared to be related to the deformation energies of the test device and connected elements, which were more deformed at a lower load speed. We also showed a serious influence of adhesive forces on the impact strength of glued joints.

中文翻译：

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改进的摆锤在粘合、铆接和混合搭接接头的冲击试验中

摘要 本文提出了一种适用于测试搭接接头冲击强度的改进型摆锤。与块状试样的试验（块状剪切试验 (ISO 9653) 中使用的试样）相比，搭接试样的冲击试验在结果方面表现出更大的可重复性。改进后的测试设备还允许测试铆钉和混合铆钉 - 粘合剂接头。对比试验表明，混合连接的冲击强度大于粘合剂和铆钉接头的冲击强度之和。我们的研究证明了冲击速度对测量的冲击强度的显着影响；这种效应似乎与测试装置和连接元件的变形能有关，它们在较低的负载速度下变形更大。