Structural integrity of polymers processed by additive manufacturing techniques using residual strength diagrams

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL Theoretical and Applied Fracture Mechanics Pub Date : 2024-10-20 DOI:10.1016/j.tafmec.2024.104727

A.J. Cano , A. Salazar , J. Rodríguez

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Abstract

Motivated by the increasingly important role that polymers have in structural applications, this study aims to analyse the structural integrity of polymers through residual strength diagrams. The polymers analysed have been thermoplastics, Polylactic acid (PLA), Polyethylene terephthalate glycol-modified (PET-G) and Polyamide 12 (PA-12), as well as a thermosetting resin, processed through different additive manufacturing techniques: Fused Deposition Modelling (FDM) in the case of PLA, PET-G, Selective Laser Sintering (SLS) for PA-12 and Digital Light Processing (DLP) for the thermosetting resin. In addition, PA-12 manufactured by injection moulding was also included in this study. To obtain the residual strength diagrams, mechanical tests have been carried out on smooth specimens and on specimens with cracks of different lengths. From the analysis of the results, a prediction has been obtained by fitting a semi-empirical model that describes the structural integrity in the areas of microstructurally short cracks, long cracks and physically short cracks.

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利用残余强度图分析通过增材制造技术加工的聚合物的结构完整性

由于聚合物在结构应用中的作用日益重要，本研究旨在通过残余强度图分析聚合物的结构完整性。所分析的聚合物包括热塑性塑料、聚乳酸（PLA）、聚对苯二甲酸乙二酯改性（PET-G）和聚酰胺 12（PA-12），以及通过不同添加剂制造技术加工的热固性树脂：聚乳酸和 PET-G 采用熔融沉积成型（FDM）技术，PA-12 采用选择性激光烧结（SLS）技术，热固性树脂采用数字光处理（DLP）技术。此外，本研究还包括通过注塑成型制造的 PA-12。为获得残余强度图，对光滑试样和带有不同长度裂纹的试样进行了机械测试。根据对结果的分析，通过拟合一个半经验模型得出了预测结果，该模型描述了微结构短裂缝、长裂缝和物理短裂缝区域的结构完整性。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.