[工学]吉林大学材料科学基础

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1、Chapter7MechanicalProperties第七章力学性质吉林大学材料科学与工程学院曹占义Mechanicalproperties:Themechanicalbehaviorofamaterialreflectstherelationshipbetweenitsresponseordeformationtoanappliedloadorforce.Importantmechanicalproperties:strength,hardness,ductility,stiffness.7.1INTR

2、ODUCTION力学性质强度硬度延性韧性7/20/20212Chapter7MechanicalPropertiesWaysthatloadapplied:Tension,CompressionSheartorsion7.2CONCEPTSOFSTRESSANDSTRAIN拉伸载荷压缩载荷剪切载荷扭转载荷7/20/20213Chapter7MechanicalPropertiesTENSIONTESTS:7.2CONCEPTSOFSTRESSANDSTRAIN7/20/20214Chapter7Mechani

3、calPropertiesCOMPRESSIONTESTS:SHEARANDTORSIONALTESTS:7.2CONCEPTSOFSTRESSANDSTRAIN7/20/20215Chapter7MechanicalPropertiesGEOMETRICCONSIDERATIONSOFTHESTRESSSTATE:7.2CONCEPTSOFSTRESSANDSTRAIN7/20/20216Chapter7MechanicalPropertiesStress–straindiagramandmodulusof

4、elasticity:7.3STRESS–STRAINBEHAVIOR7/20/20217Chapter7MechanicalPropertiesForceversusinteratomicseparationtoexplaintheelasticdeformation:7.3STRESS–STRAINBEHAVIOR7/20/20218Chapter7MechanicalPropertiesElasticmodulusdependsonatomicbonding:7.3STRESS–STRAINBEHAVI

5、OR7/20/20219Chapter7MechanicalPropertiesShearstressandstrain7.3STRESS–STRAINBEHAVIORAND7.4ANELASTICITY7.4ANELASTICITYAnelasticdeformation:Time-dependentelastic(nonpermanent)deformation.滞弹性7/20/202110Chapter7MechanicalPropertiesPoisson’sratio7.5ELASTICPROPER

6、TIESOFMATERIALS7/20/202111Chapter7MechanicalProperties7.6TENSILEPROPERTIESYIELDINGANDYIELDSTRENGTH7/20/202112Chapter7MechanicalProperties7.6TENSILEPROPERTIESTENSILESTRENGTH7/20/202113Chapter7MechanicalProperties7.6TENSILEPROPERTIESDUCTILITY塑性,延展性7/20/202114

7、Chapter7MechanicalProperties7.6TENSILEPROPERTIESMechanicalbehaviorforironatthreetemperatures.7/20/202115Chapter7MechanicalProperties7.6TENSILEPROPERTIESRESILIENCE（回）弹性、弹性能总应变能7/20/202116Chapter7MechanicalProperties7.6TENSILEPROPERTIES6.TOUGHNESS强韧性Forstatic

8、situation:theareabelowthecurveof-Fordynamic(highstrainrate)situation:notchtoughnessfracturetoughnessFordynamic(highstrainrate)situation:notchtoughness缺口冲击韧性fracturetoughnessFordynamic(highstrainrate)