Limits...
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

Discretization of the RVE.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3673070&req=5

f2-sensors-13-04051: Discretization of the RVE.

Mentions: Generalized Method of Cells (GMC), one of the most important micromechanical models, has been used in predicting effective elastic constants, mechanical properties of composites [10, 11 and 12]. For fiber-reinforced composites, the representative volume element (RVE) is extracted from the cross section which is perpendicular to the fiber direction. The RVE is divided into Nβ × Nγ sub-cells as shown in Figure 2. In the figure, h and l indicate the length of the RVE in the y2 and y3 directions, respectively. β and γ indicate the number of the sub-cells in the y2 and y3 directions, respectively. The constitutive equation of sub-cells is given by:(1)σ¯(βγ)=C(βγ)(ɛ¯(βγ)−ɛ¯P(βγ)−α(βγ)ΔT)where σ̅(βγ) is the average stress of the sub-cells. C(βγ) is the stiffness matrix of the sub-cells. ε̅(βγ) and ε̅-p(βγ) indicate the average strain and plastic strain of the sub-cells. α(βγ) and ΔT indicate thermal expansion coefficient of the sub-cells and temperature change.


Biaxial yield surface investigation of polymer-matrix composites.

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

Discretization of the RVE.
© Copyright Policy
Related In: Results  -  Collection

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

f2-sensors-13-04051: Discretization of the RVE.
Mentions: Generalized Method of Cells (GMC), one of the most important micromechanical models, has been used in predicting effective elastic constants, mechanical properties of composites [10, 11 and 12]. For fiber-reinforced composites, the representative volume element (RVE) is extracted from the cross section which is perpendicular to the fiber direction. The RVE is divided into Nβ × Nγ sub-cells as shown in Figure 2. In the figure, h and l indicate the length of the RVE in the y2 and y3 directions, respectively. β and γ indicate the number of the sub-cells in the y2 and y3 directions, respectively. The constitutive equation of sub-cells is given by:(1)σ¯(βγ)=C(βγ)(ɛ¯(βγ)−ɛ¯P(βγ)−α(βγ)ΔT)where σ̅(βγ) is the average stress of the sub-cells. C(βγ) is the stiffness matrix of the sub-cells. ε̅(βγ) and ε̅-p(βγ) indicate the average strain and plastic strain of the sub-cells. α(βγ) and ΔT indicate thermal expansion coefficient of the sub-cells and temperature change.

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