Enhancing the mechanical anchoring of stainless steel/GFRTP hybrid joint with micro-protrusion structures prepared by selective laser melting

文献类型： 外文期刊

第一作者： Su, Jianhui

作者： Su, Jianhui;Zhang, Xueyan;Xi, Xin;Chang, Shuai;Song, Xiaoguo;Tan, Caiwang;Liu, Haoran;Su, Jianhui;Zhang, Xueyan;Xi, Xin;Chen, Bo;Song, Xiaoguo;Tan, Caiwang;Tan, Caiwang;Deng, Yunhua;Zhang, Zequn

作者机构：

关键词： Selective laser melting; Laser joining; Interfacial mechanical anchoring; 316 L; GFRTP

期刊名称：THIN-WALLED STRUCTURES （ 影响因子：6.6； 五年影响因子：6.4 ）

ISSN： 0263-8231

年卷期： 2025 年 216 卷

页码：

收录情况： SCI

摘要： Achieving lightweight structural components by replacing part of metal with thermoplastic has become a new trend in industrial application. However, for lightweight components, the bonding reliability of metal and glass fiber reinforced thermoplastic (GFRTP) hybrid joint is relatively low due to the inherent physical incompatibility. In this work, the micro-scale protrusions with various heights from 0.2 mm to 0.6 mm were fabricated by selective laser melting (SLM) process on the 316 L surface to enhance laser-welded 316L/ GFRTP nylon 66 (PA66) hybrid joints. The surface free energy and roughness were significantly increased at the joining interface. The tensile-shear strength of 316L/GFRTP joint substantially increased, then gradually declined with the increase of micro-protrusion height. The effect of micro-protrusion structures on the joining interfacial of 316L/GFRTP hybrid joint was investigated by finite element analysis and digital image correlation. The results showed that the von Mise stress concentrated on the micro-protrusions and the distribution of equivalent strain at the interface of micro-protrusion samples was more uniform, reducing the stress concentration at the joining interface. Compared with untreated sample, the optimized micro-protrusion parameter (0.3 mm) exhibited the maximum shear-tensile strength of 11.72 MPa, which increased by 421 % relative to untreated case. The current work presents a simple and potential modification strategy for enhancing joining reliability between metals and thermoplastics by surface additive manufacturing.

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