Fatigue design optimization of safety components made of SMC

Fleckenstein, J.; Jaschek, Katrin; Büter, Andreas; Stoess, Nicole

doi:10.1016/j.proeng.2011.04.066

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…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]. Studies have been conducted on the fatigue life of the composite, such as failure criteria of the stiffness drop and fatigue damage accumulation [10][11][12][13][14][15].…”

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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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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“…Fleckenstein et al 31 studied the effect of preferred fiber orientations of SMC under fatigue loading. They showed that the specimens with predominantly 0° fiber alignment have the highest fatigue strength.…”

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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“…Fiber orientations and the related process induced microstructure, 8 nature of matrix, applied stresses, temperature, frequency, and induced self-heating phenomenon or environmental effects are appropriated aspects that have to be taken into account to reliably estimate the fatigue life of short fiber reinforced polymer composites. [7][8][9] Fleckenstein et al 10 performed experimental investigation on SMC samples with different preferred fiber orientations. As expected, experimental results showed that the specimens with predominantly 0 fiber alignment have the highest fatigue strength.…”

Section: Introductionmentioning

confidence: 99%

“…Fleckenstein et al. 10 performed experimental investigation on SMC samples with different preferred fiber orientations. As expected, experimental results showed that the specimens with predominantly 0° fiber alignment have the highest fatigue strength.…”

Section: Introductionmentioning

confidence: 99%

Coupled effect of loading frequency and amplitude on the fatigue behavior of advanced sheet molding compound (A-SMC)

Shirinbayan

Fitoussi

Meraghni

et al. 2016

Journal of Reinforced Plastics and Composites

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This paper presents the experimental results of tension-tension stress-controlled fatigue tests performed on advanced sheet molding compound (A-SMC). It aims at analyzing the effect of fiber orientation, loading amplitude, and frequency on the fatigue response and the related temperature evolution due to the self-heating phenomenon. Two types of A-SMC have been analyzed: randomly oriented (RO) and highly oriented (HO). The coupled effect of the loading amplitude and the frequency has been studied. It has been shown that the couple frequency-amplitude affects the nature of the fatigue overall response which can be governed by the damage mechanisms accumulation (mechanical fatigue) and/or by the self-heating (induced thermal fatigue). For fatigue loading at 100 Hz, self-heating has been observed and yielded to a temperature rise up to 70 C. The latter causes a decrease of the storage modulus related to the b-transition of the vinylester. It has been demonstrated that the self-heating produced a material softening and decreased the fatigue life. SEM observations revealed that the samples tested at 100 Hz, exhibit smooth debonding surfaces due to the induced thermal softening of the matrix whereas more brittle fracture of the matrix surrounding fibers is observed during the fatigue tests achieved at 10 Hz.

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Fatigue design optimization of safety components made of SMC

Cited by 6 publications

References 2 publications

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

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

Coupled effect of loading frequency and amplitude on the fatigue behavior of advanced sheet molding compound (A-SMC)

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