The Effect of Cooling Rate on Residual Stress in a Thermoplastic Composite

Sendeckyj, GP; Ss, Wang; Johnson, WS; Stinchcomb, WW; Pagano, N. J.; Ks, Kim; Hahn, H. T.; Croman, Robert

doi:10.1520/ctr10151j

Cited by 43 publications

(1 citation statement)

References 4 publications

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“…During the cycles, many chemical and thermal reactions occur within the laminate and internal stresses appear which come from various sources and, in particular, from unmatched thermal expansion coefficients of plies with different directions [1]. The residual stress depends on the geometry of the laminate, its material properties and the curing process used [2]. It is especially prevalent in areas in which high values can create matrix cracking and the initiation of delamination [3,4].…”

Section: Introductionmentioning

confidence: 99%

Determination of the Residual Stresses in Composite Laminate Using the Compliance Method

Montay

Sicot

Gong

et al. 2005

MSF

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Residual stresses play an important role on the mechanical behavior of composite laminate. The development of new methods to determine the residual stresses gradient within the laminates is necessary. This article presents the adaptation of the compliance method in the case of composite laminates carbon/epoxy [02/902]s. The incremental drilling of a constant width groove allows for each increment to measure the strains (using strain gages) and displacements (using an optical device) of particularly points of the structure surface. These experimental data are compared with results given by a finite elements simulation. This comparison allows to raise the residual stresses in the composite laminate.

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Section: Introductionmentioning

confidence: 99%

Determination of the Residual Stresses in Composite Laminate Using the Compliance Method

Montay

Sicot

Gong

et al. 2005

MSF

View full text Add to dashboard Cite

show abstract

Interfaces in Composites

Kim

Mai

2006

Materials Science and Technology

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Freeze–thaw resistance of unidirectional‐fiber‐reinforced epoxy composites

Xian

Lin

et al. 2011

J of Applied Polymer Sci

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The freeze-thaw resistance of unidirectional glass-, carbon-, and basalt-fiber-reinforced polymer (GFRPs, CFRPs, and BFRPs, respectively) epoxy wet layups was investigated from À30 to 30 C in dry air. Embedded optic-fiber Bragg grating sensors were applied to monitor the variation of the internal strain during the freeze-thaw cycles, with which the coefficient of thermal expansion (CTE) was estimated. With the CTE values, the stresses developed in the matrix of the FRPs were calculated, and CFRPs were slightly higher than in the BFRP and GFRP cases. The freeze-thaw cycle showed a negligible effect on the tensile properties of both GFRP and BFRP but exhibited an adverse effect on CFRP, causing a reduction of 16% in the strength and 18% in the modulus after 90 freeze-thaw cycles. The susceptibility of the bonding between the carbon fibers and epoxy to the freeze-thaw cycles was assigned to the deterioration of CFRP.

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The Effect of Cooling Rate on Residual Stress in a Thermoplastic Composite

Cited by 43 publications

References 4 publications

Determination of the Residual Stresses in Composite Laminate Using the Compliance Method

Determination of the Residual Stresses in Composite Laminate Using the Compliance Method

Interfaces in Composites

Freeze–thaw resistance of unidirectional‐fiber‐reinforced epoxy composites

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