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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture >Fracture mechanics approach to compare laser sintered parts and injection mouldings of nylon-12
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Fracture mechanics approach to compare laser sintered parts and injection mouldings of nylon-12

机译：断裂力学方法来比较尼龙12的激光烧结零件和注塑件

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摘要

In comparison to equivalent parts made by injection moulding, components manufactured by laser sintering are often perceived to offer inferior mechanical properties, yet the evidence for this is rarely based upon systematic research studies. In this paper, attempts have been made to conduct a fundamental study of the fracture behaviour of both injection moulded and laser sintered parts, based upon a modification of a standard technique used to determine linear elastic fracture mechanics parameters. The influence of specimen thickness (in the range 2–10 mm) was also included in the experimental plan, which concentrated upon the testing of single-edge notch bending (SENB) beam specimens. Force-displacement characteristics demonstrated significant plastic deformation in nylon (PA12) specimens, so that the J-integral method was used to obtain quantitative fracture parameters, including the energy requirements for crack growth. Comparisons of this parameter showed thickness-dependent ‘geometry-sensitive’ data for each set of samples. For the injection moulded SENB specimens, energy absorption decreased with increasing thickness, a result attributed to the influence of plane-strain-dominated conditions. In contrast, laser sintered samples exhibited increased toughness as specimen thickness increased towards 10 mm; this could not be explained by density or particle melting data and may be interpreted by changes in molecular structure that occur during the additive manufacturing process.
机译：与注塑成型的同类零件相比，通过激光烧结制造的零件通常被认为提供了较差的机械性能，但是很少有系统研究的证据。在本文中，基于对用于确定线性弹性断裂力学参数的标准技术的修改，已尝试对注射成型和激光烧结零件的断裂行为进行基础研究。实验计划中还包括了试样厚度的影响（在2-10 mm范围内），其重点在于单边切口弯曲（SENB）梁试样的测试。力-位移特性表明尼龙（PA12）试样具有明显的塑性变形，因此使用J积分方法获得定量的断裂参数，包括裂纹扩展所需的能量。此参数的比较显示了每组样品的厚度相关的“几何敏感”数据。对于注塑成型的SENB样品，能量吸收随着厚度的增加而降低，这归因于平面应变主导条件的影响。相反，随着样品厚度向10mm增加，激光烧结样品的韧性增加。这不能用密度或颗粒熔化数据来解释，而可以用增材制造过程中发生的分子结构变化来解释。

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