Tension–Compression Asymmetry in the Off-Axis Nonlinear Rate-Dependent Behavior of a Unidirectional Carbon/Epoxy Laminate at High Temperature and Incorporation into Viscoplasticity Modeling

$61.20 plus tax (Refund Policy)

Buy Article:

Abstract:

Off-axis compressive deformation behavior of a unidirectional CFRP laminate at high temperature and its strain-rate dependence in a quasi-static range are examined for various fiber orientations. By comparing the off-axis compressive and tensile behaviors at an equal strain rate, the effect of different loading modes on the flow stress level, rate-dependence and nonlinearity of the off-axis inelastic deformation is elucidated. The experimental results indicate that the compressive flow stress levels for relatively larger off-axis angles of 30°,45° and 90° are about 50 percent larger than in tension for the same fiber orientations, respectively. The nonlinear deformations under off-axis tensile and compressive loading conditions exhibit significant strain-rate dependence. Similar features are observed in the fiber-orientation dependence of the off-axis flow stress levels under tension and compression and in the off-axis flow stress differential in tension and compression, regardless of the strain rate. A phenomenological theory of viscoplasticity is then developed which can describe the tension–compression asymmetry as well as the rate dependence, nonlinearity and fiber orientation dependence of the off-axis tensile and compressive behaviors of unidirectional composites in a unified manner. It is demonstrated by comparing with experimental results that the proposed viscoplastic constitutive model can be applied with reasonable accuracy to predict the different, nonlinear and rate-dependent behaviors of the unidirectional composite under off-axis tensile and compressive loading conditions.

Keywords: CARBON FIBER; EPOXY; HIGH TEMPERATURE; NONLINEAR BEHAVIOR; OFF-AXIS COMPRESSION; OFF-AXIS TENSION; RATE DEPENDENCE; TENSION-COMPRESSION ASYMMETRY; UNIDIRECTIONAL COMPOSITES; VISCOPLASTIC CONSTITUTIVE MODEL

Document Type: Research Article

DOI: http://dx.doi.org/10.1163/156855109X434702

Affiliations: 1: Department of Engineering Mechanics and Energy, University of Tsukuba, Tsukuba 305-8573, Japan 2: Graduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba 305-8573, Japan 3: Aerospace Research and Development Directorate, Japan Aerospace Exploration Agency, Mitaka 181-0015, Japan 4: Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara 229-8510, Japan

Publication date: August 1, 2009

Related content

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more