Fracture mechanics of laser sintered cracked polyamide for a new method to induce cracks by additive manufacturing

被引：31

作者：

Brugo, T. ^{[1
]}

Palazzetti, R. ^{[2
]}

Ciric-Kostic, S. ^{[3
]}

Yan, X. T. ^{[2
]}

Minak, G. ^{[1
]}

Zucchelli, A. ^{[1
]}

机构：

[1] Univ Bologna, DIN Dept, Viale Risorgimento 2, I-40136 Bologna, Italy

[2] Univ Strathclyde, DMEM Dept, 75 Montrose St, Glasgow G1 1XJ, Lanark, Scotland

[3] Univ Kragujevac, Fac Mech & Civil Engn Kraljevo, Dositejeva 19, Kraljevo 36000, Serbia

来源：

POLYMER TESTING | 2016年 / 50卷

基金：

英国工程与自然科学研究理事会;

关键词：

Selective Laser Sintering; Fracture mechanics; Digital control imaging; Additive manufacturing; STRESS; PARTS;

D O I：

10.1016/j.polymertesting.2016.01.024

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper presents an experimental investigation on specimens manufactured by Selective Laser Sintering (SLS), with the purposes of giving designers advice when designing 3D printed parts, and laying the basis for a step forward in the field of fracture mechanics of 3D complex parts. The aim is to investigate the effect of building direction in Polyamide (PA) 3D printed samples and to assess whether a crack can be initiated directly from the sintering process for fracture mechanics study purposes. Six different configurations of Mode I Compact Tension (CT) specimens were manufactured and tested; the experiments were monitored by Digital Image Correlation (DIC) and fractured surfaces were analyzed using microscopy. Results showed that samples with better mechanical performance are those in which all the layers contain a portion of the crack. On the other hand, those with layers parallel to the crack plan offer a preferential pathway for the crack to propagate. DIC and fractography investigations showed that, under certain conditions, small-radius geometries, or too-close surfaces may bond together depending on printer resolution. Experiments also showed that SLS is capable of printing specimens with internal cracks that can be used to study fracture mechanics of complex parts or parts with internal cracks. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：301 / 308

页数：8

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