Effects of geometry and thermal aging on the strength of 3D-printed polymer parts

Mohammad Reza Khosravani, Tamara Reinicke
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Abstract

Based on advantages of additive manufacturing (AM), this technology is becoming one of the most popular and preferable manufacturing processes in different industries. Although AM was introduced for fabrication of prototypes, it has been used for production of end-use products. Consequently, the mechanical strength of AMed parts has become of significant importance. In the present study, Influence of geometry and thermal aging on the mechanical strength of AMed parts has been investigated. To this aim, polylactic acid material was used to print specimens based on fused deposition modeling process. Since geometry of AMed parts has effect on their mechanical behavior, the specimens with three different geometries are fabricated and examined. Particularly, dumbbell-shaped, smooth, and V-notched specimens were subjected to tensile load under static loading conditions. In addition, in order to evaluate Influence of thermal environment, we carried out an accelerated thermal aging within temperatures of -5°C to 35°C, which is below glass temperature of the examined material. Experimental results showed different fracture behaviors and tensile strength due to the different geometries. Moreover, based on a series of tests, the failure behavior of original and aged specimens are determined. The outcomes of this study confirmed that the geometrical appearance and environmental working conditions of AMed parts must be taken into account in the design of these components.

几何形状和热老化对 3D 打印聚合物部件强度的影响
基于增材制造(AM)的优势,该技术正成为不同行业中最流行、最受欢迎的制造工艺之一。虽然增材制造最初是用于制造原型,但现在已被用于生产终端产品。因此,AMed 零件的机械强度变得非常重要。本研究调查了几何形状和热老化对 AMed 零件机械强度的影响。为此,使用聚乳酸材料在熔融沉积建模工艺的基础上打印试样。由于 AMed 零件的几何形状会对其机械性能产生影响,因此制作并检测了三种不同几何形状的试样。其中,哑铃形、光滑和 V 型缺口试样在静态加载条件下承受拉伸载荷。此外,为了评估热环境的影响,我们在-5°C 至 35°C(低于受检材料的玻璃温度)的温度范围内进行了加速热老化。实验结果表明,由于几何形状不同,断裂行为和拉伸强度也不同。此外,基于一系列测试,确定了原始试样和老化试样的破坏行为。研究结果证实,在设计 AMed 部件时,必须考虑这些部件的几何外观和环境工作条件。
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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CiteScore
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