Fatigue Testing of Flexible Foams

Stone, Herman

doi:10.1177/0021955x8301900106

Cited by 4 publications

(2 citation statements)

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“…Literature on sandwich composites has focused on damage accumulation mechanisms, the effect of notches, environmental effects and the effect of frequency at various stress levels [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Fatigue life characterization is performed within the limitations imposed by the equipment used [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…Most of the specimen testing occurs in expensive tension compression machines that operate at low frequencies (0-10 Hz). Disagreement in experimental results has been seen in the literature [2,3], since material testing systems and their conditions inconsistently vary from one laboratory to another. Fatigue analysis of composite materials may require probabilistic methods [1,2,7,8] due to the random data scatter that is typically found in experiments.…”

Section: Introductionmentioning

confidence: 99%

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Development of a Vibration Technique Based on Geometric Optimization for Fatigue Life Evaluation of Sandwich Composite Structures

et al. 2021

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A major obstacle to obtaining cost-effective experimental data on the fatigue life of sandwich panels is the prohibitive amount of time and cost required to carry out millions of cycles. On the other hand, vibration techniques applied to sandwich geometries fail to match the stress patterns that are obtained from standard flexural fatigue tests. To overcome such limitations, a vibration-based fatigue technique is proposed, which entails the use of sandwich specimens whose geometries are optimized to reproduce the stress distribution observed during three point bend loading while vibrating at the first resonant frequency. The proposed vibration technique was experimentally validated. The results, compared with the average number of cycles to failure at different stress ratios obtained via the Three-Point Bending test, showed high levels of accuracy. The proposed method is robust and time effective and indicates the possibility of attaining fatigue lifetime prediction of a wide class of composite elements, such as sandwich panels.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of a Vibration Technique Based on Geometric Optimization for Fatigue Life Evaluation of Sandwich Composite Structures

et al. 2021

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Damage evolution in flexible polyurethane foams

Kau

Huber

Hiltner

et al. 1992

J of Applied Polymer Sci

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SYNOPSISMicrocrazing in the struts of flexible polyurethane foams was discovered during compressive deformation and observed directly in the scanning electron microscope. Attributed to this phenomena was the decrease in stress at maximum compression and the intensity of acoustic emission during compressive cycling. The higher content of styrene-acrylonitrile ( SAN ) copolymer in these foams resulted in higher modulus, more severe microcrazing, an increase in acoustic emission activity, and a decrease in the stress at maximum compression as cycling progressed.

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SPI Study-Flexible Foam In-Use Fatigue Testing for Chairs

Knight¹

1987

Journal of Cellular Plastics

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Fatigue Testing of Flexible Foams

Cited by 4 publications

References 0 publications

Development of a Vibration Technique Based on Geometric Optimization for Fatigue Life Evaluation of Sandwich Composite Structures

Development of a Vibration Technique Based on Geometric Optimization for Fatigue Life Evaluation of Sandwich Composite Structures

Damage evolution in flexible polyurethane foams

SPI Study-Flexible Foam In-Use Fatigue Testing for Chairs

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