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首页> 外文会议>DE-vol.119; CED-vol.11; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20061105-10; Chicago,IL(US) >VALIDATION OF A COMPOSITE STRENGTH PREDICTION METHODOLOGY BASED ON CRITICAL FAILURE VOLUME
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VALIDATION OF A COMPOSITE STRENGTH PREDICTION METHODOLOGY BASED ON CRITICAL FAILURE VOLUME

机译：基于临界破坏量的复合强度预测方法的验证

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摘要

The strength prediction of composites with stress concentrations is concerned with material response in small highly stressed volumes. Direct evaluation of material strength in such areas is difficult to achieve in practice. On the other hand, the ability of such small regions to sustain loads exceeding the average strength measured on uniformly loaded coupons, e.g. ASTM standard for axial strength testing in unidirectional composites, is the foundation of the long standing Whitney-Nuismer point and average stress failure criteria. These criteria postulate that the failure of a composite with stress concentrations occurs when a finite size volume near the stress concentration is loaded at or above the average strength measured on standard test coupons without stress concentrators. The size of this volume constitutes an additional material property. While proving accurate and efficient for capturing the notch size effect on strength within a given laminate family, these dimensions have not found clear physical interpretation and appear not to represent a fundamental material property. The present paper reports results for a Weibull-based integral approach for composite laminates with open holes. The emphasis is on evaluation of the limits of the applicability of the traditional Weibull integral based fiber-direction strength scaling.
机译：具有应力集中的复合材料的强度预测与小高应力体积下的材料响应有关。在实践中很难直接评估材料强度。另一方面，这种小区域承受负荷的能力超过了均匀加载的试样所测得的平均强度。单向复合材料轴向强度测试的ASTM标准是长期存在的Whitney-Nuismer点和平均应力破坏标准的基础。这些标准假定当应力集中附近的有限尺寸体积加载到或高于在没有应力集中器的标准测试试样上测得的平均强度时，会发生应力集中的复合材料失效。该体积的大小构成了附加的材料属性。尽管已证明在给定的层压板系列中可以准确有效地捕获缺口尺寸对强度的影响，但这些尺寸尚未找到清晰的物理解释，而且似乎不代表基本的材料性能。本文报道了基于Weibull积分方法的复合材料层压板的开孔结果。重点是评估基于传统威布尔积分的纤维方向强度定标的适用范围。

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