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J. Compos. Sci., Volume 1, Issue 1 (December 2017)

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Editorial

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Open AccessEditorial Journal of Composites Science: A New Journal for Composite Materials, Structures and Experiments
J. Compos. Sci. 2017, 1(1), 1; doi:10.3390/jcs1010001
Received: 28 February 2017 / Accepted: 28 February 2017 / Published: 2 March 2017
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Research

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Open AccessArticle Experimental and Numerical Analysis of Fiber Matrix Separation during Compression Molding of Long Fiber Reinforced Thermoplastics
J. Compos. Sci. 2017, 1(1), 2; doi:10.3390/jcs1010002
Received: 7 April 2017 / Revised: 4 May 2017 / Accepted: 5 May 2017 / Published: 16 May 2017
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Abstract
During the compression molding of long fiber reinforced plastics, significant deviations in fiber content have been observed. These can lead to a decrease of mechanical properties, which could ultimately lead to component failure. Experiments in compression molding with long fiber reinforced plastics in
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During the compression molding of long fiber reinforced plastics, significant deviations in fiber content have been observed. These can lead to a decrease of mechanical properties, which could ultimately lead to component failure. Experiments in compression molding with long fiber reinforced plastics in a complex structure show significant fiber jamming and decrease in fiber content in ribbed sections. The occurring Fiber Matrix Separation (FMS) during processing is assumed to be caused by intensive fiber interaction. The governing mechanisms on FMS are evaluated and a mechanistic model is applied to simulate and predict the effect of FMS during compression molding. Full article
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Open AccessArticle The Induced Stress Field in Cracked Composites by Heat Flow
J. Compos. Sci. 2017, 1(1), 4; doi:10.3390/jcs1010004
Received: 27 April 2017 / Revised: 28 May 2017 / Accepted: 29 May 2017 / Published: 6 June 2017
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Abstract
A multiscale (micro-macro) approach is proposed for the establishment of the full thermal and induced stress fields in cracked composites that are subjected to heat flow. Both the temperature and stresses’ distributions are determined by the solution of a boundary value problem with
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A multiscale (micro-macro) approach is proposed for the establishment of the full thermal and induced stress fields in cracked composites that are subjected to heat flow. Both the temperature and stresses’ distributions are determined by the solution of a boundary value problem with one-way coupling. At the micro level and for combined thermomechanical loading, a micromechanical analysis is employed to determine the effective moduli, coefficients of thermal expansion and thermal conductivities of the undamaged composite. At the macro level, the representative cell method is employed according to which the periodic damaged composite region is reduced, in conjunction with the discrete Fourier transform, to a finite domain problem. As a result, a boundary value problem is obtained in the Fourier transform domain, which is appropriately discretized and solved. The inverse transform and an iterative procedure provide the full thermal and stress fields. The proposed method is verified by comparisons with exact solutions. Applications are given for the determination of the thermal and stress fields in cracked fiber-reinforced polymeric composite, cracked porous ceramic material and cracked periodically-layered ceramic composite caused by the application of heat flow. The presented formulation admits however the application of a combined mechanical and heat flux on cracked composites. Full article
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Open AccessArticle Creep Behavior of Resin Matrix and Basalt Fiber Reinforced Polymer (BFRP) Plate at Elevated Temperatures
J. Compos. Sci. 2017, 1(1), 3; doi:10.3390/jcs1010003
Received: 16 April 2017 / Revised: 19 May 2017 / Accepted: 22 May 2017 / Published: 24 May 2017
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Abstract
Pre-stressed fiber reinforced polymer (FRP) has great application potential in structural strengthening. However, the elevated temperature resistance of FRPs is always a key concern due to the poor thermal stability of its resin matrix. In this study, the effects of temperature on the
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Pre-stressed fiber reinforced polymer (FRP) has great application potential in structural strengthening. However, the elevated temperature resistance of FRPs is always a key concern due to the poor thermal stability of its resin matrix. In this study, the effects of temperature on the creep behavior of the resin matrix and basalt fiber reinforced polymer (BFRP) was experimentally investigated. The tensile stresses were set at 2.6 MPa for the resin matrix and 522 MPa (35% of its ultimate tensile strength (fu)) for BFRP, and the exposure temperatures were 25 °C, 80 °C, 120 °C, and 160 °C. The short-term strain of the resin matrix and BFRP exposed to different exposure temperatures was measured. The variation of the thermal property and interlaminar shear strength (ILSS) of the BFRP were studied. The results indicated that molecular chain disruption and post-cure coexisted. The resin matrix is sensitive to the exposure temperatures, and a remarkable increase of the strain was observed when the exposure temperature exceeded its glass transition temperature (107.5 °C). The resin matrix fractured within 50 seconds when it was exposed to 160 °C. BFRP showed excellent temperature resistance even though the exposure temperature exceeded its glass transition temperature (123.7 °C). Sustained loading led to stress transferring to the basalt fiber in BFRP specimens, especially at elevated temperatures. Stress redistribution caused interfacial damage, and ILSS decreased by 0.5%, 13.6%, and 14.6% for 80 °C, 120 °C, and 160 °C exposure from its original value of 73.5 MPa. Dynamic mechanical thermal analysis (DMTA) was used to explain the post-curing and interface damage of BFRP. Full article
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