PSI - Issue 17

Feiyang He et al. / Procedia Structural Integrity 17 (2019) 72–79 Feiyang He/ Structural Integrity Procedia 00 (2019) 000 – 000

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Figure 3 Applied Load Condition for Specimen (Balaban and Tee, 2019)

Nguyen et al. (2019) developed an extended four-node consecutive-interpolation quadrilateral element to study numerically the thermo-mechanical crack growth in orthotropic composite materials. In the research, they re formulated the maximum circumferential stress criterion applied to orthotropic materials to judge the crack propagation with the consideration of angular variation of fracture toughness. Barbero (2018) proposed a methodology based on discrete damage mechanics and a careful characterisation of the required temperature-dependent material properties to predict thermo-mechanical damage for laminated composites during monotonic cooling. The temperature-dependent material properties were determined through the linear regression of a quadratic polynomial with the experimental data at low room temperature and high temperature. Then, with the application of modified Griffith’s criterion , the critical energy release rates were considered to be temperature dependent. However, their analytical micromechanics model was only suitable for the temperature range of the experimental data used for material characterisation. Attia et al. (2018) investigated the stresses and stress intensity factor of gas pipes made of functionally graded materials with the numerical method. Based on the finite element model developed in ABAQUS, the paper discussed the impact of unsteady thermal and mechanical loads on the crack propagation. Bao and McMeeking (1995) proposed the micromechanical model for fibre reinforced metal matrix composites. The model considered the effect of thermal expansion between the matrix and the fibre to investigate the in-phase and out-phase thermo-mechanical fatigue. The paper also predicted the stress intensity factor at the crack tip and matrix fatigue crack growth under thermo-mechanical load. Nowadays, with growing requirements of applications, manufacturing tends to fabricate components with a quick and affordable solution (Gibson et al., 2017). Therefore, with the complexity of free and customization advantages over subtractive manufacturing, Additive Manufacturing (AM) became a popular way of manufacturing as rapid prototyping in the recent decade. As an AM technology, fused deposition modelling (FDM) fabricates parts layer-by layer based on 3D computer-aided designs (CAD) with using thermoplastic material. Because it is most common to use ABS material in FDM, it is significant to research the fatigue and fracture of ABS with the in-service loads. Domínguez Almaraz et al. (2015) investigated the crack initiation and propagation on the polymeric material Acrylonitrile Butadiene Styrene (ABS), under ultrasonic fatigue testing. Lee and Huang (2013) determined the effects of fatigue on FDM dog bone with ABS material using the experimental method. The paper investigated the cyclic load data of FDM ABS through analysing its cycle-by-cycle strain energy. Correa et al. (2019) investigated the crack initiation and propagation for ABS material with a cyclic constant displacement test. The fracture surfaces are analysed to identify the general trends for crack initiation and propagation under the loading conditions. Apart from loading condition, many other parameters can affect the fatigue performance of ABS. Ziemian et al. (2015) define the effect of specimen microstructure on tensile-fatigue life. They presented fatigue performance 4. Fatigue and Fracture Research for Polymeric Material