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首页> 美国卫生研究院文献>Materials >Contribution to Reduce the Influence of the Free Sliding Edge on Compression-After-Impact Testing of Thin-Walled Undamaged Composites Plates
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Contribution to Reduce the Influence of the Free Sliding Edge on Compression-After-Impact Testing of Thin-Walled Undamaged Composites Plates

机译：减少自由滑动边缘对薄壁无损复合材料板冲击后压缩测试的影响的贡献

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摘要

Standard Compression-After-Impact test devices show a weakening effect on thin-walled specimens due to a free panel edge that is required for compression. As a result, thin-walled undamaged samples do not break in the free measuring area but near the free edge and along the supports. They also show a strength reduction due to the free edge which can become potentially relevant for very weakly damaged panels. In order to reduce the free edge influence on the measured strength, a modified Compression-After-Impact test device has been developed. In an experimental investigation with carbon fiber reinforced plastics, the modified device is compared with a standard device. It is shown that thin-walled undamaged specimens investigated with the modified device now mainly break within the free measuring area and no longer at the free edge and along the bearings as it is the case for standard test devices. The modified device does not cause a free edge weakening effect in comparison to standard devices. The modified device is therefore more suitable for determining the compression strengths of undamaged thin-walled composite plates.
机译：由于压缩需要自由的面板边缘，因此标准的冲击后压缩测试设备对薄壁样品的减弱作用。结果，薄壁的未损坏样品不会在自由测量区域破裂，而是在自由边缘附近并沿着支撑物破裂。由于自由边缘，它们还显示出强度降低，这对于非常薄弱的​​面板可能具有潜在的意义。为了减少自由边缘对测量强度的影响，开发了一种改进的冲击后压缩测试装置。在使用碳纤维增强塑料进行的实验研究中，将改进后的设备与标准设备进行了比较。结果表明，采用标准装置进行测试的薄壁无损样品现在主要在自由测量区域内破裂，不再像标准测试装置那样在自由边缘和沿轴承破裂。与标准设备相比，修改后的设备不会引起自由边缘削弱效果。因此，改进的装置更适合于确定未损坏的薄壁复合板的抗压强度。

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