GMW-14736-2007.pdf
《GMW-14736-2007.pdf》由会员分享,可在线阅读,更多相关《GMW-14736-2007.pdf(4页珍藏版)》请在三一文库上搜索。
1、Test Method Materials GMW14736 Determination of the Torsional Force-Deflection Characteristics of Elastomeric Components under uni-axial Stress 1 Scope Note: Nothing inthisstandard supersedes applicable laws and regulations. Note: In the event of a conflict between the Eng- lish and the domestic lan
2、guage, the English language shall take precedence. 1.1 Theobjectofthis test method isthe determination of the torsional characteristics shown by elastomeric components used in vehicles under a constant angu- lar rate of strain at a temperature of (+23 5) C. 1.2 Objectives. 1.2.1 The determination of
3、 the torsional force-deflec- tion characteristics of elastomeric components. This test method supplies data on the viscoelastic properties of the elastomer, and also on the cohesive strength of interference fits between rubber and metal of the elastomeric components. The determination of the torsion
4、al force acting on the elastomeric component when strained to the vehicle installation conditions. 1.3 Definitions. 1.3.1 Uni-axial Stress. Uni-axial stress defines the case, inwhich the onlyforce acting on the elastomeric component is the torque M acting about the axis of rotation of the elastomeri
5、c component. 1.3.2 Torque M. The torque M is the moment acting on the elastomeric component to produce a stress. Its magnitude, direction and axis are defined by the vehicle installation conditions. 1.3.3 Torque max M. The torque max M is the maxi- mum torque M,with which the elastomeric component i
6、s stressed in addition to the initial torque Mv. 1.3.4 Torque Mv. The torque Mvis the initial torque, which is applied to the elastomeric component in order to establish a datum point for measure- ments. Its direction is the same as that of torque M, and its magnitude normally not more than 1 % of t
7、orque max M. 1.3.5 Angle .The angle is the angle, through which the clamping devices on the elastomeric com- ponent rotate relative to each other under the effect of torque M, in the direction of application of torque M. 1.3.6 Angle v. The angle vis the angle, through which the clamping devices on t
8、he elastomeric com- ponent rotate relative to each other under the effect of torque Mv, in the direction of application of torque Mv. 1.3.7 Angular Velocity . The angular velocity is the constant angular velocity, at which the clamping devices onthe elastomeric component are rotated rel- ative to ea
9、ch other by the torque M. 1.3.8 Torsional Force-deflection Curve M = f (). The torsional force-deflection curve M = f () is the mapping of the relationship between torque M and the angle when the applied torque moves from M = Mv to M = Mv+ max M at an angular velocity . 1.3.9 Stress Cycle.One stress
10、 cycle is the sequence whereby the elastomeric component is stressed by a torque steadily increasing from M = Mv to M = Mv+ max M, and then steadily reducing back to M = Mv. 1.3.10 Initial Curve. The initial curve is the torsional force-deflection curve obtained during the first stress cycle, in whi
11、ch the elastomeric component is stressed from M = Mvto M = Mv+ max M. 1.3.11 Angle f. The angle fis the angular change between the clamping devices on the elastomeric component relative to one another, which is mea- sured from the commencement of the first stress cycle until the end of the third str
12、ess cycle. The stress cycles have to be performed continuously. The angle fmay be due to creep properties of the elastomer, or slipping between interference fits on the component. 1.3.12 Subscripts. Alphabetical and numerical sub- scripts shall be used to identify measurement values and stress direc
13、tions. 1.3.12.1 Alphabetical subscripts indicate the type of measurement value e.g. Mv- Initial torque. Copyright 2007 General Motors Corporation All Rights Reserved Publication Department: GME Specification Center December 2007Page 1 of 4 PRD045 - VPRE ST 1 10/03 GMW14736GM WORLDWIDE ENGINEERING ST
14、ANDARDS 1.3.12.2 Numerical subscripts identify the direction of application of a stress, generally denoted by i. i shall take a value 1, 2, 3,n. The numerical subscript shall follow any alphabetic subscript, which may be used e.g. Mv1, 1. If there is only one direction in which a torque is applied,
15、the numerical subscript 1 may be excluded, e.g. Mv. 2 References Note: Only the latest approved standards are appli- cable unless otherwise specified. 2.1 External Standards/Specifications. DIN 51220 2.2 GM Group Standards/Specifications. None. 2.3 Additional References. None. 3 Test Equipment 3.1 A
16、 torsion testing machine, capable of stressing elastomeric components up to a maximum torque M = 350 Nm max. at a constant angular velocity (maximum deviation 10 %). The machine shall comply with DIN 51220, and also comply with the following requirements: Total accuracy of the torque measuring equip
17、- ment: 2 % of the measured value Torsional displacement measuring equipment: 1.75 m rad Note: A torsion testing machine, which meets these conditions were built e.g.in Product Engineering, Material Development, Physical Section, according to the following design drawings: Testing machine for dampen
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- GMW 14736 2007
链接地址:https://www.31doc.com/p-3765115.html