We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
A practical model to predict the time-dependent behaviour of angle-ply laminates from limited creep data.
- Authors
Miranda Guedes, Rui
- Abstract
Modelling non-linear behaviour of polymers and polymer fibre-reinforced composites retains significant interest due to its extensive application in primary structures. Simple models are helpful in the design, preferably calibrated from a few short-term mechanical tests. Creep tests are simple to implement, and their duration may depend on the period of interest to analyse. The Norton–Bailey law complies with simplicity and effectiveness when representing the creep response. The time-dependent mechanical response of polymers under arbitrary loading conditions may follow two different theories; time- and strain-hardening. The formal demonstration developed here allowed us to link these two theories to specific time-integration schemes employed in the past. However, both formulations lead to the same expression for the creep-loading condition, which implies the same model parameters in this case. Few research works have applied these theories to polymer-based composites restricted to study the creep-loading condition. Here, a novel approach proposes to model the time-dependent behaviour through the time-hardening and strain-hardening theories with a single viscoplastic element governed by a Norton–Bailey or a Singh–Mitchell law. Experimental data collected from the literature of carbon-reinforced epoxy angle-ply laminates supported the validation process under different loading conditions. The calibration of the model parameters proceeds from creep data at two different stress levels. Thus, time- and strain-hardening theories made predictions for distinct loading conditions, i.e. for multiple creep and creep-recovery cycles, constant strain rate and multi-step stress relaxation. The strain-hardening formulation proved capable of predicting the time-dependent response under different loading conditions from a unique set of model parameters. The current methodology reduces the effort needed to characterise engineering materials when considering the time-dependent behaviour, particularly for polymer-based composites.
- Subjects
LAMINATED materials; TIME integration scheme; FIBROUS composites; STRAIN rate; STRAINS &; stresses (Mechanics); VISCOPLASTICITY; CREEP (Materials)
- Publication
Mechanics of Time-Dependent Materials, 2023, Vol 27, Issue 4, p1043
- ISSN
1385-2000
- Publication type
Article
- DOI
10.1007/s11043-022-09544-1