Journal ArticleDOI
Cumulative creep damage for polycarbonate and polysulfone
M. J. Zhang,H. F. Brinson +1 more
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In this article, a cumulative damage law or modified time fraction rule is developed using a power law for transient creep response as the starting point, and experimental results are approximated well by the new rule.Abstract:
Creep to failure tests performed on polycarbonate and polysulfone under single and two step loadings are discussed. A cumulative damage law or modified time fraction rule is developed using a power law for transient creep response as the starting point. Experimental results are approximated well by the new rule. Damage and failure mechanisms associated with the two materials are suggested.read more
Citations
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Journal ArticleDOI
Creep rupture and viscoelastoplasticity of polypropylene
TL;DR: In this paper, the authors derived constitutive equations for the viscoelastic and viscoplastic responses of semicrystalline polymers at three-dimensional deformations with small strains.
Journal ArticleDOI
Relationship between lifetime under creep and constant stress rate for polymer-matrix composites
TL;DR: In this article, two existing theoretical approaches for creep failure criteria of viscoelastic materials are reviewed and the relationship obtained between the creep-rupture and constant stress rate until failure is investigated.
Journal ArticleDOI
Analysis of a delayed fracture criterion for lifetime prediction of viscoelastic polymer materials
TL;DR: In this paper, a multi-axial yield/failure model for viscoelastic/plastic materials is applied, which was developed by Naghdi and Murch (in J.Mech. 30:321-328, 1963) and later extended and refined by Crochet (inJ. Mech. 33:327-334, 1966), to predict long-term creep rupture of polymers.
Book ChapterDOI
Lifetime prediction of polymers and polymer matrix composite structures: Failure criteria and accelerated characterization
TL;DR: In this article, the authors present theoretical approaches to long-term failure criteria and accelerated characterization experiments concerning longterm failure behavior of fiber-reinforced polymers in civil engineering applications.
Journal ArticleDOI
Cumulative creep damage for unidirectional composites under step loading
TL;DR: In this article, the authors used nonlinear cumulative-damage laws to predict the lifetime of unidirectional composite materials under step loading, based on constant loading durability diagram, for the two-step creep loading condition.
References
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Journal ArticleDOI
On the characterization of nonlinear viscoelastic materials
TL;DR: In this paper, a set of three-dimensional constitutive equations is proposed which is consistent with nonlinear behavior of some metals and plastics, and which enables all properties to be evaluated from uniaxial creep and recovery data.
Journal ArticleDOI
Fractional calculus in the transient analysis of viscoelastically damped structures
Ronald L. Bagley,Peter J. Torvik +1 more
TL;DR: In this article, the authors used fractional calculus to model the viscoelastic behavior of a damping layer in a simply supported beam and analyzed the beam by using both a continuum formulation and a finite element formulation to predict the transient response to a step loading.
Journal ArticleDOI
A Modified Superposition Principle Applied to Creep of Nonlinear Viscoelastic Material Under Abrupt Changes in State of Combined Stress
William N. Findley,J. S. Y. Lai +1 more
TL;DR: In this article, a modified superposition principle has been employed to describe creep in the nonlinear range under combined stresses which change abruptly from time to time, and the stress function fij employed is derived from three integrals of the multi-integral theory for constant stress.