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Progressive tearing failure in pultruded composite material tubes

机译：拉挤复合材料管的连续撕裂破坏

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Progressive tearing failure has been identified as an important damage mechanism in single-cell, thin-walled, rectangular pultruded composite material tubes subjected to transverse (bending) loads. This progressive failure occurs along the corners of the tube at the junction between the cell walls and propagates in a stable fashion as the transverse load is increased. This allows the lube to undergo large global flexural deformation as well as local cell wall deformation needed to develop membrane response before ultimate failure. The response enhances load-carrying capacity in the tube and provides energy absorption during the failure. A numerical method has been developed to model the crack propagation along the corners of the tube using an energy criterion. The energy release rate for the mixed-mode crack propagation corresponding to the progressive tearing failure has been determined for pullruded composite material tubes that were tested in a previously reported experimental study. Effects of different tube configurations, geometries, and end-supports on the energy absorption are reported. It was found that substantial energy can be dissipated by the progressive tearing failure of the tube if appropriate axial restraint is provided at the ends of the tube.
机译：渐进式撕裂失效已被认为是承受横向（弯曲）载荷的单室，薄壁，矩形拉挤复合材料管的重要破坏机理。这种渐进式破坏发生在细胞壁之间连接处的管子拐角处，并随着横向载荷的增加而稳定地传播。这使得润滑油在最终失效之前要经历大的整体挠曲变形以及局部的细胞壁变形，以产生膜响应。该响应提高了管中的承载能力，并在故障期间吸收了能量。已经开发出一种数值方法来模拟使用能量准则沿着管子拐角的裂纹扩展。对于拉挤复合材料管，已经确定了与渐进式撕裂破坏相对应的混合模式裂纹扩展的能量释放速率，该材料已在先前报道的实验研究中进行了测试。报告了不同的管配置，几何形状和端支撑对能量吸收的影响。已经发现，如果在管的端部提供适当的轴向约束，则管的渐进式撕裂故障可以耗散大量能量。

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