Effect of fiber orientation distribution on constant fatigue life diagram of chopped carbon fiber chip-reinforced Sheet Molding Compound (SMC) composite

Tang, Haibin; Chen, Zhangxing; Zhou, Guowei; Sun, Xuze; Li, Yang; Huang, Liangliang; Guo, Hao; Kang, Hong Tae; Zeng, Deliang; Engler-Pinto, Carlos; Su, Xuming

doi:10.1016/j.ijfatigue.2019.04.016

Cited by 21 publications

(16 citation statements)

References 31 publications

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“…Significant material heterogeneity has been reported, with significant local equivalent modulus variations in the same specimen [5,7,11,13]. Digital image correlation showed how the final failure usually develops in areas of local lower-than-average stiffness [5,14]. The material hence fails at local strain values ranging from 1.5% to 3%, even though the average failure strain is usually lower than 1% [5,6,11].…”

Section: Introductionmentioning

confidence: 99%

Morphology-induced fatigue crack arresting in carbon fibre sheet moulding compounds

Martulli

Muyshondt

Kerschbaum

et al. 2020

International Journal of Fatigue

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Carbon Fibre Sheet Moulding Compounds (CF-SMCs) are tow-based composite materials. Interrupted fatigue tests, combined with computed tomography, were performed here to investigate the damage mechanisms in high in-mould flow CF-SMC.The tow-based microstructure created obstacles for fatigue damage propagation, increasing the CF-SMC's resistance against cyclic loading. Failure is shown to nucleate inside the tows, but inter-tow crack propagation tends to be hindered by the presence of the other tows. Tows oriented perpendicularly to the initial fatigue crack stop the crack itself, showing an intrinsic crack arrest mechanism. Additionally, pre-existing manufacturing cracks or voids do not propagate at all. As a result, flatter slopes of the SN diagrams were observed for CF-SMC than for other carbon or glass fibre composites with short, long and even continuous fibres.

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Section: Introductionmentioning

confidence: 99%

Morphology-induced fatigue crack arresting in carbon fibre sheet moulding compounds

Martulli

Muyshondt

Kerschbaum

et al. 2020

International Journal of Fatigue

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“…Echaabi et al investigated the failure criteria of a composite material according to the stress and strain of various components [7]. Tang et al investigated the material behavior of SMC under three different cyclic loading conditions, i.e., tension-tension (T-T), compression-compression (C-C), and tension-compression (T-C) [8]. Fleckenstein et al investigated the influences of different fiber orientations and fiber weight contents on the fatigue strength behavior of this long-fiber reinforced thermosetting material on SMC [9].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life Prediction for Carbon-SMC and Carbon-FRP by Considering Elastic Modulus Degradation

Kim

Lim

et al. 2021

J. Compos. Sci.

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In the automotive industry, being lightweight has become an important design factor with the enhancement of environmental regulations. As a result, many studies on the application of composite materials are in progress. Among them, interest in carbon materials, such as carbon sheet molding compound (C-SMC) and carbon-fiber-reinforced plastic (CFRP), which have excellent strength and stiffness, is increasing. However, CFRP is a material that makes it difficult to secure economic feasibility due to its relatively high manufacturing costs and limited mass production, despite its excellent mechanical strength and durability. As a result, many studies have been conducted on C-SMC as an alternative carbon composite material that can be easily mass-produced. In this regard, this study intended to conduct a study on evaluating the fatigue strength of C-SMC and CFRP among mechanical properties due to the lack of clear failure criteria for fatigue design. We investigated the tensile and fatigue strengths of C-SMC and CFRP, respectively. In the case of C-SMC, the mechanical strength tests were conducted for two different width conditions to evaluate the cutting effect and the machining methods to assess the effects of the edge conditions. To evaluate the fatigue failure assessment criteria, the stiffness drop and elastic modulus degradation criteria were applied for each fatigue test result from the C-SMC and CFRP. The results confirmed that the rationality of the failure criteria in terms of the stiffness drop and the application of the fatigue life prediction of C-SMC based on elastic modulus degradation demonstrated promising results.

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“…To formulate the equation of SMC composites, it is necessary to have enough information about mechanical properties and especially damage phenomena under different modes of loading such as monotonic or fatigue. 10,11 Fatigue response of composites is usually characterized by the Wöhler curve, which is a curve giving the value of cyclic stress/strain amplitude versus the number of cycles to failure, N. 2,[12][13][14][15][16] The parameters that can affect the cyclic behavior are fiber orientations, applied stress/ strain, temperature, frequency, and self-heating. 2,[14][15][16] Strain rate and temperature are two important parameters, which effect on material behavior under different solicitation modes such as tension, compression, shear, and torsion.…”

Section: Introductionmentioning

confidence: 99%

Multiscale damage analysis of the tension‐tension fatigue behavior of a low‐density sheet molding compound

Shirinbayan

2020

J of Applied Polymer Sci

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This article presents the experimental findings of tension-tension stresscontrolled fatigue tests performed on low-density sheet molding compound (LD-SMC). LD-SMC composite is a type of SMC including a polyester resin reinforced with chopped glass fibers bundles and hollow glass spheres. The coupled frequency-amplitude affects the nature of the overall fatigue response, which can be controlled by the damage mechanisms accumulation and/or by the self-heating. In fact, the self-heating produced a material softening and decreased the fatigue lifetime. For fatigue loading at 80 Hz, self-heating has been observed and yielded to a temperature rise to 65 C, which is more than a glass transition temperature of polyester. Thus, the polyester matrix is subjected to remarkable thermally activated modifications of its physical state. Multiscale damage analysis of the randomly-oriented sample in fatigue showed that the first observed damage phenomenon corresponds to the debonding of the hollow glass microspheres occurring in the fiber depleted zones.

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Effect of fiber orientation distribution on constant fatigue life diagram of chopped carbon fiber chip-reinforced Sheet Molding Compound (SMC) composite

Cited by 21 publications

References 31 publications

Morphology-induced fatigue crack arresting in carbon fibre sheet moulding compounds

Morphology-induced fatigue crack arresting in carbon fibre sheet moulding compounds

Fatigue Life Prediction for Carbon-SMC and Carbon-FRP by Considering Elastic Modulus Degradation

Multiscale damage analysis of the tension‐tension fatigue behavior of a low‐density sheet molding compound

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