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Biaxial yield surface investigation of polymer-matrix composites.

Ye J, Qiu Y, Zhai Z, He Z - Sensors (Basel) (2013)

Bottom Line: This article presents a numerical technique for computing the biaxial yield surface of polymer-matrix composites with a given microstructure.On this basis, the manufacturing process thermal residual stress and strain rate effect on the biaxial yield surface of composites are considered.The results show that the effect of thermal residual stress on the biaxial yield response is closely dependent on loading conditions.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Ministry of Education for Electronic Equipment Structure Design, Xidian University, Xi'an 710071, China. ronkey6000@sina.com

ABSTRACT
This article presents a numerical technique for computing the biaxial yield surface of polymer-matrix composites with a given microstructure. Generalized Method of Cells in combination with an Improved Bodner-Partom Viscoplastic model is used to compute the inelastic deformation. The validation of presented model is proved by a fiber Bragg gratings (FBGs) strain test system through uniaxial testing under two different strain rate conditions. On this basis, the manufacturing process thermal residual stress and strain rate effect on the biaxial yield surface of composites are considered. The results show that the effect of thermal residual stress on the biaxial yield response is closely dependent on loading conditions. Moreover, biaxial yield strength tends to increase with the increasing strain rate.

No MeSH data available.


Related in: MedlinePlus

Strain rate influence on σxx – σyy yield surface of composites: (a) 15° fiber-reinforced composites; (b) 30° fiber-reinforced composites; (c) 45° fiber-reinforced composites.
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f12-sensors-13-04051: Strain rate influence on σxx – σyy yield surface of composites: (a) 15° fiber-reinforced composites; (b) 30° fiber-reinforced composites; (c) 45° fiber-reinforced composites.

Mentions: The effects of a strain rate range of 0.0001/s to 0.01/s on the biaxial yield strength of fiber-reinforced composites with thermal residual stress under σxx – σyy and σxx – σxy conditions can be seen in Figures 12 and 13, respectively. Three different fiber off-axis angles (15°, 30°, 45°) are discussed. From the figures, it can be found that the biaxial yield strength exhibits a significantly rate-dependence in the σxx – σyy and σxx – σxy stress planes similar to the uniaxial loading conditions. Increasing the strain rate will increase the biaxial yield strength of polymer-matrix composites. Furthermore, strain rate effects on the biaxial yield surface can be hardly discerned if the fiber off-axial angle is 15° in the σxx – σxy stress plane.


Biaxial yield surface investigation of polymer-matrix composites.

Ye J, Qiu Y, Zhai Z, He Z - Sensors (Basel) (2013)

Strain rate influence on σxx – σyy yield surface of composites: (a) 15° fiber-reinforced composites; (b) 30° fiber-reinforced composites; (c) 45° fiber-reinforced composites.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3673070&req=5

f12-sensors-13-04051: Strain rate influence on σxx – σyy yield surface of composites: (a) 15° fiber-reinforced composites; (b) 30° fiber-reinforced composites; (c) 45° fiber-reinforced composites.
Mentions: The effects of a strain rate range of 0.0001/s to 0.01/s on the biaxial yield strength of fiber-reinforced composites with thermal residual stress under σxx – σyy and σxx – σxy conditions can be seen in Figures 12 and 13, respectively. Three different fiber off-axis angles (15°, 30°, 45°) are discussed. From the figures, it can be found that the biaxial yield strength exhibits a significantly rate-dependence in the σxx – σyy and σxx – σxy stress planes similar to the uniaxial loading conditions. Increasing the strain rate will increase the biaxial yield strength of polymer-matrix composites. Furthermore, strain rate effects on the biaxial yield surface can be hardly discerned if the fiber off-axial angle is 15° in the σxx – σxy stress plane.

Bottom Line: This article presents a numerical technique for computing the biaxial yield surface of polymer-matrix composites with a given microstructure.On this basis, the manufacturing process thermal residual stress and strain rate effect on the biaxial yield surface of composites are considered.The results show that the effect of thermal residual stress on the biaxial yield response is closely dependent on loading conditions.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Ministry of Education for Electronic Equipment Structure Design, Xidian University, Xi'an 710071, China. ronkey6000@sina.com

ABSTRACT
This article presents a numerical technique for computing the biaxial yield surface of polymer-matrix composites with a given microstructure. Generalized Method of Cells in combination with an Improved Bodner-Partom Viscoplastic model is used to compute the inelastic deformation. The validation of presented model is proved by a fiber Bragg gratings (FBGs) strain test system through uniaxial testing under two different strain rate conditions. On this basis, the manufacturing process thermal residual stress and strain rate effect on the biaxial yield surface of composites are considered. The results show that the effect of thermal residual stress on the biaxial yield response is closely dependent on loading conditions. Moreover, biaxial yield strength tends to increase with the increasing strain rate.

No MeSH data available.


Related in: MedlinePlus