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1、陈继乐专业：工程力学学号：1120150528SummaryInthisterm,IhavelearnedprofessionalEnglishclassofMr.Sun.Therearefivestudentsinthisclass.Eachofuswouldmakeapresentationinclass.Ihavelearnedalot.Hereisthemaincontentofmypresentations.1.TheIntroductionofmechanicsofmaterialsTheresearchobjectofmechanicsofmateri
2、alsisstructuremember.Structuremembersincludebar,rod,plate,shellandclumpbody.Barandrodarethemainobjectsofmechanicofmaterial.Thetaskofmechanicsofmaterialsisasfollowing.Undertherequestthatthestrength,rigidity,stabilityissatisfied,offeringthenecessarytheoreticalfoundationandcalculationmeth
3、odfordeterminingreasonableshapesanddimensions,choosingpropermaterialsforthecomponentsatthemosteconomicprice.Therearefourassumptionsofthesoliddeformablebodiesincludingcontinuity,homogeneity,isotropyandsmalldeformations.Basictypesofthedeformationofrodsareaxialtension,shear,torsionandbend
4、ing.2.StaticallydeterminateproblemsIfforcesactonabody,thelinesofactionoftheseforcesareinthesameplace,whichcalledcoplanarforcessystem.Toageneralcoplanarforcesystem,therearethreeindependentequationswhichcandetermine3unknownquantities.Thatare,,,whichmeanthetotalforceinxaxisandyaxisareequa
5、ltozeroandthetotalmomentofpointOisequaltozero.Whenthenumberofequationsislargerthanorequaltothenumberofunknownquantities,itisastaticallydeterminateproblem.Whenthenumberofequationsislessthantothenumberofunknownquantities,itisastaticallyindeterminateproblem.Andstaticallyindeterminateprobl
6、emscanbesolvedbytheconditionsofcompatibility.3.PlanetrussesAtrussisastructurethatismadeofstraight,slenderbarsthatarejoinedtogethertoformapatternoftriangles.Therearethreeassumptionsofplanetrusses.1.theweightsofthemembersarenegligible.2.alljointsarepin.3.theappliedforcesactatjoints.Accor
7、dingtothreeassumptions,wecangetconclusionthateachmemberofatrussisatwo-forcebody.Andtherearetwomethodsofcalculationoftheforcesinthemembersofatruss,1.Methodofjoint.2.Methodofsection.3.CompositiveMotionofaParticleInpractice,weoftenobservethemotionwithrespecttoamovingbody.Theremayexistre
