Effects of the fiber waviness on the reduction of mechanical properties of unidirectional CFRP

Takada, Yuta; Miyake, Tetsuo; Toba, Keisuke; Futamura, Michinari

doi:10.1299/jsmemm.2016.os12-10

The Proceedings of the Materials and Mechanics Conference

2016

DOI: 10.1299/jsmemm.2016.os12-10

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Effects of the fiber waviness on the reduction of mechanical properties of unidirectional CFRP

Yuta Takada

Tetsuo Miyake²,

Keisuke Toba³

et al.

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2018

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Evaluation of Effect of Forming Conditions on Internal Pressure Strength in Press-Formed CFRTP Hemispheres Using Measured Fiber Stress

Miyake¹,

Shimizu²

2018

SOSEI-TO-KAKOU

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In this study, the degradation of the strength of press-formed hemispheres of thermoplastic matrix composite (CFRTP) was investigated considering the residual stress in fibers generated during the forming process. CFRTP sheets reinforced with woven carbon fiber fabric were stamped into hemispheres under various conditions of die temperature and blank holding force. The strength of formed hemispheres was evaluated by the internal pressure test. Residual stress in fibers around the fracture origin was directly measured by the micro-Raman spectroscopy and then its relation with the internal pressure strength was examined. As a result, die temperature was found to have negligible effect on the fracture pressure. On the other hand, blank holding force strongly influenced the internal pressure strength. The variation in strength was well correlated with fiber residual stress, which varied little with die temperature but changed significantly with blank holding force. It was well explained that the decrease in strength could be mostly due to fiber residual stress. Fiber residual stress differed with location, resulting in a local distribution of strength in the press-formed composites.

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Evaluation of Effect of Forming Conditions on Internal Pressure Strength in Press-Formed CFRTP Hemispheres Using Measured Fiber Stress

Miyake¹,

Shimizu²

2018

SOSEI-TO-KAKOU

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show abstract

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Effects of the fiber waviness on the reduction of mechanical properties of unidirectional CFRP

Cited by 1 publication

References 0 publications

Evaluation of Effect of Forming Conditions on Internal Pressure Strength in Press-Formed CFRTP Hemispheres Using Measured Fiber Stress

Evaluation of Effect of Forming Conditions on Internal Pressure Strength in Press-Formed CFRTP Hemispheres Using Measured Fiber Stress

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