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MPP008 Damage in fiber composites 7.5 ECTS credits | |
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TIMEPERIOD: Q IV LANGUAGE:English EXAMINER Janis Varna Univ lekt PREREQUISITES Laminate Theory, basic of Elasticity Theory, matrix algebra and ordinary differential equations. COURSE AIM The course provides an understanding of the basic deformation and damage mechanism in fiber composites and renders skills for experimental observation and predictive modeling of different damage modes and their effect on performance of composites. Students will learn to use commercial software packages and apply an advanced design methodology based on concept of "allowed controlled damage". CONTENTS Mechanics of composite laminates: Unidirectional composites: micro-mechanical models, stress-strain relationships for anisotropic materials, transformation of stress, strain and stiffness. Hygro-thermal effects. Failure mechanisms, criteria. Laminate theory in including hygro-thermal effects. Failure analysis in laminates. Plydiscount model. Fracture toughness: Crack growth analysis based on energy balance. DCB test. Data reduction methods: beam theory, compliance callibration, energy - area calculation. Failure criteria for notched composites Damage accumulation: Experimental results on transverse cracking, delamination, crack branching. Micromechanics of damaged laminates: reduction of thermo-elastic properties because of damage, damage evolution. Models for transverse cracking: sheaz lag model, variational methods. Continuum damage mechanics modelling.
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| Laboratory work and homework | 6.00ECTS |
| Written exam | 1.50ECTS |
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COURSE LITERATURE 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 Further information: International Office |
Web Editor: Karin.Lindholm@dc.luth.se
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