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MPP005 Damage in fiber composites 6.0 ECTS credits | |
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TIMEPERIOD: Q III LANGUAGE:English EXAMINER Janis Varna Univ lekt PREREQUISITES Laminate Theory, Elasticity Theory, matrix algebra and ordinary differential equations. COURSE AIM The course provides an understanding of the damage mechanisms in laminates and renders skills for experimental observation of different damage modes and their effect on thermo-elastic properties of laminates. Methodology of the theoretical modelling, in order to analyse the effect of damage on laminate performance, will give the student the ability to make modelling predictions of laminate behavior. CONTENTS Unidirection al composite properties: Micromechanical models of termo-elastic properties. Mechanisms of failure. Elastic macroproperties. Failure criteria. Laminate failure analysis: Stress state, stiffness and compliance matrices in arbitrary system of coordinates. Laminate constitutive equations. Ply discount model and stepwise laminate failure. Fracture toughness: Crack growth analysis based on energy balance. DCB test. Data reduction methods: beam theory, compliance callibration, energy - area calculation. Damage accumulation: Experimental results on transverse cracking, delamination, crack branching. Micromechanical approach: reduction of thermo-elastic properties because of damage, damage evolution. Models for transverse cracking: sheaz lag model, variational methods. Continuum damage mechanics modelling. TEACHING EXAMINATION COURSE GRADE SCALE: ITEMS/CREDITS | |
| Laboratory work and homework | 3.90ECTS |
| Written exam | 2.10ECTS |
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COURSE LITTERATURE 1. Agarwal, BD; Broutman, LJ; "Analysis and Performance of Fiber Composites", 2nd edition, Wiley-Interscience. 2. R, Talreja (editor), "Damage Mechanics of Composite Materials", Composite Materials Series, vol.9, Elsevier. REMARKS |
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