Effect of Geometry and Orientation on the Tensile Properties and Failure Mechanisms of Compliant Suture Joints
Effect of Geometry and Orientation on the Tensile Properties and Failure Mechanisms of Compliant Suture Joints
复制标题
DOI：
10.1021/acsami.2c21925
复制
发表时间：
2023-02-17
影响因子：
9.5
通讯作者：
Cox，Lewis M.
中科院分区：
文献类型：
--
作者：
Darabi，Amir;Long，Rong;Cox，Lewis M.
由刚性基质包围的顺应性缝线存在于生物装甲和甲壳中，提供增强的机械性能。了解这些缝合复合材料实现卓越性能的机制是开发具有更高强度和韧性的工程材料的关键。本文研究了缝线几何形状和载荷方向对使用两阶段反应性聚合物树脂的缝线接头性能的影响，该树脂能够在单个聚合物网络内轻松地消除机械异质性。具有不同几何形状的顺应性正弦缝线被重新排列成刚性矩阵，产生2个数量级的模量对比。经验关系开发连接缝合线的波长和振幅的复合材料的性能在平行和垂直的负载条件下。结果表明，当垂直于缝合接头施加载荷时，更大的缝合线交错广泛地改善了复合材料性能，但当平行于接头施加载荷时，会产生有害影响。垂直载荷下的失效机制研究突出了损伤开始后缝线几何形状和裂纹扩展稳定性之间的相互作用。我们的研究结果可以为未来的工程复合材料和生物启发结构提供框架。
Compliant sutures surrounded by stiff matrices are present in biological armors and carapaces, providing enhanced mechanical performance. Understanding the mechanisms through which these sutured composites achieve outstanding properties is key to developing engineering materials with improved strength and toughness. This article studies the impact of suture geometry and load direction on the performance of suture joints using a two-stage reactive polymer resin that enables facile photopatterning of mechanical heterogeneity within a single polymer network. Compliant sinusoidal sutures with varying geometries are photopatterned into stiff matrices, generating a modulus contrast of 2 orders of magnitude. Empirical relationships are developed connecting suture wavelength and amplitude to composite performance under parallel and perpendicular loading conditions. Results indicate that a greater suture interdigitation broadly improves composite performance when loading is applied perpendicular to suture joints but has deleterious effects when loading is applied parallel to the joint. Investigations into the failure mechanisms under perpendicular loading highlight the interplay between suture geometry and crack growth stability after damage initiation occurs. Our findings could enable a framework for engineering composites and bio-inspired structures in the future.