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ID:38601394
大小:1.10 MB
页数:37页
时间:2019-06-16
《吉林大学机械设计(a)典型习题》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、习题2-2Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.σa/MPaσm/MPa450460280图示40钢的极限应力图。已知用此材料制成的转动
2、心轴,工作时危险截面的最大弯曲应力,综合影响系数求轴的计算安全系数。Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.L例1:一横板用两个普通螺栓联在立柱上,已知P=4000N,L=200mm,a=100mm,f=0.15,,试求螺栓小径.aPPLa当两个螺栓水平放置时的计算过程Evaluationonly.CreatedwithAspose.Sl
3、idesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.D=150mmDT例:联轴器用6个普通螺栓联接。传递的扭矩T=150N·M,螺栓材料的许用应力[]=140,f=0.15,,求螺栓小径。F横向载荷不滑移条件:强度条件:Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd
4、.例2:图示气缸盖用6个普通螺栓联接,已知气缸压力p=2MPa,D=80mm,取试求:1、螺栓小径;2、安装时预紧力pDEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.HLLP例3:图示支座用2个螺钉联接,已知P=800N,H=120mm,L=80mm,取摩擦系数f=0.15,防滑系数试求螺栓小径.Evaluationonly.Createdwi
5、thAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.D=100mmp螺栓材料的极限应力图σm/MPaσa/MPa20010015010050500450250300350图示气缸用10个M10(小径d1=8.3mm)普通螺栓联接。已知气缸直径D=100mm,工作压力p=0~4MPa,螺栓连接的相对刚度cb/(cb+cm)=0.86,安装预紧力Fp=5410N。螺栓材料的极限应力图如图示。试:1、若
6、取安全系数S=1.5,验算螺栓静强度;2、在极限应力图上,标出螺栓的工作应力点W,确定其极限应力点W‘。Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.5-12Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011Aspose
7、PtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.例:一对标准直齿圆柱齿轮传动,参数见表,试分析哪个齿轮接触强度高;哪个齿轮弯曲强度高
8、。解:因为相啮合齿轮接触应力相等,所以大的接触强度高,既齿轮1接触强度高。3904501.732.286045324205001.522.97175031ZBm齿轮因为相啮合齿轮值不相等,值大的弯曲强度高,求:所以齿轮2弯曲强度高。Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.例题:一对直齿圆柱齿轮传动,在传动比、中心距和其他条
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