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Volume 19 (1993)
- Issue 6 Pages 201-
- Issue 5 Pages 163-
- Issue 4 Pages 125-
- Issue 3 Pages 81-
- Issue 2 Pages 39-
- Issue 1 Pages 1-
Volume 19, Issue 3
Displaying 1-4 of 4 articles from this issue
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Hiroshi HAYASHI1993 Volume 19 Issue 3 Pages 81-94
Published: May 15, 1993
Released on J-STAGE: August 11, 2009
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H. SEKINE, H. SUZUKI, S. KINUGAWA1993 Volume 19 Issue 3 Pages 95-100
Published: May 15, 1993
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDeformation and fracture behavior of notched cross-ply CFRP laminates has been simulated computationally by use of a probabilistic fracture model. On the basis of the Weibull weakest link theory, the tension-softening relation is first determined and then the equation of macroscopic fracture energy of the laminates is derived. The nonlinearity of the load-displacement curve is explained from the viewpoint of the nonlinearity of shear modulus and the serration from the viewpoint of the scatter of debond stress and pull-out length. It is found that the results of the computational simulation and the experiment agree well.View full abstractDownload PDF (668K) -
H. SEKINE, S. KAMIYA, T. SASAKI1993 Volume 19 Issue 3 Pages 101-108
Published: May 15, 1993
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDamage ahead of notch tips in random fiber reinforced SMC composites consists of a group of microcracks. In this paper, the computational simulation method of the damage extension is proposed by making a model of the damage mechanism and applying the concept of fracture mechanics to the formation of damage. From observations of the damage, we realized that the damage zone consists of matrix cracks and debondings of strands and only bridgings of strands bear the load in the damage zone. We first derive the governing equation of the formation of damage, which is the relationship between the released elastic strain energy and the compliance. Then, in view of this equation and the stochastic process of strand breakage, the damage extension behavior is computationally simulated with the finite-element method, in which the damage zone is made of the truss to consist of debonding strands bridging inside. The computational simulation results appear to be in agreement with the experimental results, and we come to the conclusion that the proposed simulation method is useful for the evaluation of fracture behavior of random fiber reinforced SMC composites.View full abstractDownload PDF (1178K) -
I. CHOU, I. KIMPARA, K. KAGEYAMA, I. OHSAWA1993 Volume 19 Issue 3 Pages 109-119
Published: May 15, 1993
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSThe objective of this study was to investigate the effect of fiber orientation on Mode I and Mode II interlaminar fracture toughness of CFRP laminates by conducting DCB (Double Cantilever Beam) tests and ENF (End Notched Flexure) tests. In Mode I loading, Mode I interlaminar fracture toughness at initiation, GIC, became higher as the fiber orientation inclined to the crack propagating direction. Mode I interlaminar fracture toughness during propagation, GIR, were almost constant macroscopically in two cases of the delamination at [0/0] interlamina of unidirectional specimen and the [(0/90)/(0/90)] interlamina of plain weave specimen. The delamination at [0/0] interlamina showed a stable fracture behavior. However, the delamination at [(0/90)/(0/90)] interlamina showed a cross-linked stable-unstable fracture behavior. Contrary to it, GIR increased immediately as the crack propagated and as the fiber orientation inclined to the crack propagating direction. In Mode II loading, Mode II interlaminar fracture toughness at initiation, GIIC, became lower, on the contrary to the case of Mode I, as the fiber orientation inclined to the crack propagating direction. Mode II interlaminar fracture toughness during propagation, GIIR, increased immediately as the crack propagated, nothing to do with the fiber orientation, and as the fiber orientation inclined to the crack propagating direction. The fracture surface observation by SEM was also added.View full abstractDownload PDF (1284K)
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