Fracture assessment of blunt V-notched 3D-printed ABS: Proposing a new specimen for testing and different criteria for prediction

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL Theoretical and Applied Fracture Mechanics Pub Date : 2024-10-30 DOI:10.1016/j.tafmec.2024.104742

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Abstract

In this research, a new specimen, called double-edge notched diagonally loaded square plate (DEN-DLSP), is proposed and tested in order to examine the tensile fracture behavior of blunt V-notched Acrylonitrile Butadiene Styrene (ABS) material additively manufactured by using the fused deposition modeling (FDM) method. This test specimen is actually a modified version of the round-tip V-notched diagonally loaded square plate (RV-DLSP) specimen having two edge round-tip V-notches instead of the internal rhombic slot with blunt V-shaped corners. The DEN-DLSP specimen requires less material for fabrication, and dealing with FDM-made polymeric materials, it can be produced without generating undesired local sites of stress concentration. Five different raster angles in unidirectional orientations, the notch opening angle of 90 (deg.), and three different notch tip radii are examined in this study. It is shown that the virtual isotropic material concept (VIMC) in combination with the point stress (PS), mean stress (MS), and averaged strain energy density (ASED) criteria as well as the extended finite element method (XFEM) coupled with the cohesive zone model (CZM) could be satisfactorily used to estimate the fracture loads of the 3D-printed DEN-DLSP specimens. It is revealed that using DEN-DLSP specimen for the mode I notch fracture toughness testing of 3D-printed ABS material is successful, and it is suggested to be used in similar tests for other additively manufactured polymeric materials as well as various engineering materials.

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钝 V 形缺口 3D 打印 ABS 的断裂评估：提出新的测试样本和不同的预测标准

本研究提出并测试了一种名为 "双边缺口对角加载方板（DEN-DLSP）"的新试样，以检验利用熔融沉积建模（FDM）方法添加制造的钝V型缺口丙烯腈-丁二烯-苯乙烯（ABS）材料的拉伸断裂行为。该试样实际上是圆尖 V 形缺口斜向加载方板（RV-DLSP）试样的改进版，其两个边缘为圆尖 V 形缺口，而不是带有钝 V 形角的内部菱形槽。DEN-DLSP 试样制作所需的材料较少，而且使用 FDM 聚合物材料制作时，不会产生不必要的局部应力集中。本研究考察了五种不同的单向光栅角、90（deg.）切口开口角和三种不同的切口尖端半径。结果表明，虚拟各向同性材料概念（VIMC）与点应力（PS）、平均应力（MS）和平均应变能密度（ASED）准则以及与内聚区模型（CZM）相结合的扩展有限元法（XFEM）相结合，可以令人满意地用于估算 3D 打印的 DEN-DLSP 试样的断裂载荷。结果表明，使用DEN-DLSP试样对3D打印ABS材料进行模I缺口断裂韧性测试是成功的，建议将其用于其他添加制造的高分子材料以及各种工程材料的类似测试。

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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.