Enhancing the fracture resistance of additive manufactured polylactic acid via Morse-code-like architecturing

IF 10.3 1区工程技术 Q1 ENGINEERING, MANUFACTURING

Additive manufacturing Pub Date : 2024-08-05 DOI:10.1016/j.addma.2024.104418

Deepesh Yadav, Balila Nagamani Jaya

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Abstract

Additively manufactured poly-lactic acid (PLA) suffers from a limited fracture resistance. In this study, a combination of circular hole (dot) and elliptical hole (dash) architectures inspired from the Morse-Code are incorporated into (PLA) through additive manufacturing (AM) to improve their fracture resistance. The circular hole-like (C) features work as crack arrestors and the elliptical hole-like (E) features work as crack deflectors. A combination of simulations and experiments are performed to quantifiably determine the effect of single feature, double features, and other tailored arrangements of these features on the crack driving force and fracture resistance using elastic-plastic fracture mechanics. All the AM architecture systems show a significantly higher fracture resistance compared to the bulk AM PLA. Amongst the various systems tested, both the initiation work of fracture and total work of fracture are found to be the highest for alternative layers of E-C features. A 1172 % increase is observed from initiation to total work of fracture for the EC architecture, which is reflected in the fracture resistance curve (R-curve). This has important applications in the structural integrity and life of biomedical systems made from PLA. The applicability of work of fracture and conventional fracture mechanics for additively manufactured, architected systems with significant crack tip plasticity is also discussed.

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通过类似莫尔斯编码的结构增强添加剂制造的聚乳酸的抗断裂性

增材制造聚乳酸（PLA）的抗断裂性有限。本研究从摩尔斯电码中汲取灵感，将圆孔（圆点）和椭圆孔（破折号）的结构组合通过增材制造（AM）技术融入聚乳酸（PLA）中，以提高其抗断裂性。圆孔状（C）特征可用作裂纹捕捉器，而椭圆孔状（E）特征可用作裂纹偏转器。模拟和实验相结合，利用弹塑性断裂力学定量确定了这些特征的单特征、双特征和其他定制排列对裂纹驱动力和抗断裂性的影响。与块状 AM 聚乳酸相比，所有 AM 结构系统都显示出明显更高的抗断裂性。在测试的各种体系中，E-C 特征替代层的断裂起始功和断裂总功都是最高的。从断裂起始功到断裂总功，EC 结构增加了 1172%，这反映在断裂抗力曲线（R 曲线）上。这对于提高聚乳酸生物医学系统的结构完整性和使用寿命具有重要意义。此外，还讨论了断裂功和传统断裂力学对具有显著裂纹尖端塑性的添加剂制造成型系统的适用性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Additive manufacturing Materials Science-General Materials Science

CiteScore

19.80

自引率

12.70%

发文量

648

审稿时长

35 days

期刊介绍： Additive Manufacturing stands as a peer-reviewed journal dedicated to delivering high-quality research papers and reviews in the field of additive manufacturing, serving both academia and industry leaders. The journal's objective is to recognize the innovative essence of additive manufacturing and its diverse applications, providing a comprehensive overview of current developments and future prospects. The transformative potential of additive manufacturing technologies in product design and manufacturing is poised to disrupt traditional approaches. In response to this paradigm shift, a distinctive and comprehensive publication outlet was essential. Additive Manufacturing fulfills this need, offering a platform for engineers, materials scientists, and practitioners across academia and various industries to document and share innovations in these evolving technologies.