[工学]中国石油大学工程力学课件tm101sta

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1、2021/7/19KylinsoftStatics-1-1ENGINEERINGMECHANICS(Ⅰ)STATICS&MECHANICSOFMATERIALSPirateCaptain2021/7/19KylinsoftStatics-1-2Introduction2021/7/19KylinsoftStatics-1-31Whatisengineeringmechanics?Engineeringmechanicsisthebranchofphysicsthatconsiderstheactionofforcesonbodiesorfluidsthatarebothatrestandi

2、nmotion;Engineeringmechanicsisthebranchofengineeringthatappliestheprinciplesofmechanicstomechanicaldesign.2021/7/19KylinsoftStatics-1-42021/7/19KylinsoftStatics-1-52BranchofEngineeringMechanics(一).理论力学TheoreticalMechanics研究对象：质点Particle、质点系SystemofParticles、刚体RigidBody(1).静力学Statics(2).运动学Kinemati

3、cs(3).动力学Dynamics(二).材料力学MechanicsofMaterials研究对象：可变形固体DeformableBody2021/7/19KylinsoftStatics-1-63InertialreferenceframesAninertialreferenceframeisdefinedtobeanyrigidcoordinatesysteminwhichNewton’slawsofparticlemotionrelativetothatframearevalidwithanacceptabledegreeofaccuracy.Inmostdesignapplicatio

4、nsusedonthesurfaceoftheearth,aninertialframecanbeapproximatedwithsufficientaccuracybyattachingthecoordinatesystemtotheearth.2021/7/19KylinsoftStatics-1-74SystemofunitsSIUnits2021/7/19KylinsoftStatics-1-8Chapter1PrinciplesofStatics2021/7/19KylinsoftStatics-1-91.1IntroductiontoStatics研究物体在平衡状态下的科学。即研

5、究物体在力的作用下处于平衡状态的规律及其应用。对象：Particle、SystemofParticles、RigidBody任务:(1)FBD(TheFree-bodyDiagram)物体的受力分析。(2)Reducing(Resultants)ofForcesystems力系的简化(即用一简单力系代替原有力系而不改变其对物体的作用效果)。(3)EquilibriumEquations力系的平衡条件。2021/7/19KylinsoftStatics-1-101.2ForceDefinition:Forceisthenameassignedtothemutualinteractionbet

6、weentwobodiesthatproducesthedeformationofthebodiesand/oraffectsthemotionofthebodies.Contactforcesarisefromthedirectcontactbetweenbodiesandarefrequentlyreferredtosimplyas"pushes"or"pulls."Fieldforcesdonotresultfromthedirectcontactoftwobodiesbutareappliedremotely;examplesoffieldforcesaregravitationala

7、ndelectromagneticforces.TheunitofforceinSIunitsistheNewton(N).2021/7/19KylinsoftStatics-1-11静载荷（staticload）与动载荷（dynamicload）体积力（体力）与表面力（面力）面力体力集中力(ConcentratedLoad)与分布力(DistributedLoad)2021/7/19Kylins