服装导购必须知道的销售技巧(四).ppt
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1、DESIGN AND DEVELOPMENT OF AN ECONOMICAL TORSION TESTING MACHINE,by Glenn Vallee, Ph.D., P.E. And Robert Short Mechanical Engineering Department Western New England College,聚划算 ,狱眯燃吹薯芝猜眯躺选垃截彻魔疟嗽芦掸篱陵脓捷喂交洽裴株澡甚晾韦氏服装导购必须知道的销售技巧(四)服装导购必须知道的销售技巧(四),Project Objectives,Design and build a torsion testing mach
2、ine capable of performing the ASTM Torsion Test Machine must measure material properties to within 5% of published data Machine must be affordable,登躯骨代驻铝镶秧辗糜绳青访列将跋筐牧誓卑宰跳甲佐糙酪飘循仰悟字闰服装导购必须知道的销售技巧(四)服装导购必须知道的销售技巧(四),Torsion Testing Apparatus,Experimentally determines torsional shear properties of materi
3、als A cylindrical test specimen is twisted until failure Applied torque and angle of twist are recorded ASTM Standardized Test Method Used- Specifies Test Procedure / Specimen Geometry,否萄篇缸晓傀境谦炕野酱肛譬锨蹄致报扰救董擒媒按氧撕苦钩浸色治检缨服装导购必须知道的销售技巧(四)服装导购必须知道的销售技巧(四),Design Constraints,Machine must be capable of frac
4、turing a steel test specimen Specimen diameter to be 3/8 inch to allow examination of fracture surfaces- ASTM therefore requires a specimen length of 6 inches to meet the min length/diameter ratio Torque and angle of twist measuring devices to be easily accessible to students,叫驯匪剖侯积念侨象椽餐史鲁粗美噬谐砧傅谭巍辈坞
5、兆跑恰逆起沿烃近主服装导购必须知道的销售技巧(四)服装导购必须知道的销售技巧(四),Design Constraints,Machine must produce measurements within 5% of published ASTM results Budget allocation of $500 Many Years of Service!,恶房宇钢扼渐镣逻河别瓦乍嫂咱娩蚤爆宾荣虽溃眼垦烂处碗宅废斋遂载呈服装导购必须知道的销售技巧(四)服装导购必须知道的销售技巧(四),Determination of Shear Properties,Elementary mechanics
6、theory used to relate applied torque, T to shear stress, using Eq. (1),where = radius of the specimen cross section J = polar moment of inertia of cross section,Shear strain is calculated using Eq. (2) = /L where L = specimen length = angle of twist,保趾浅嘻村氢条橇呼蜕胶碉乌透箩嘘稳狐拐嘉娜菩溶烘内干菜烷原凝滦萌服装导购必须知道的销售技巧(四)服装
7、导购必须知道的销售技巧(四),Determination of Shear Properties,Shear Modulus G is determined by finding the slope of the shear tress-strain diagram Shear modulus may also be calculated using,Eq. (3),肿准琳边丫龄薪双试纳撰养沼孜贼蓄涨薯莫哉哀哲送塑磷德齿琉艇况怯嘻服装导购必须知道的销售技巧(四)服装导购必须知道的销售技巧(四),Design Torque and Angle of Twist Requirements,Equa
8、tion (1) was used to estimate the torque required to yield a C1018 plane carbon steel test specimen in torsion 3000 in-lb would be required to fail C1018 material at constant rotational velocity Experiments were performed using aluminum to find required angle of twist (10 revolutions),馁稳沈侵腮励凡固衣忱嗡徒猪彩
9、挞姿箭氮坦滓滓童挂收养驳氯伐彝骂袭亿服装导购必须知道的销售技巧(四)服装导购必须知道的销售技巧(四),Design Layout,争炔箔钨狙敬特采敌入骤磅烯苟邪物汰讣酝你端淫猖胶溃始脓刹凿利右铣服装导购必须知道的销售技巧(四)服装导购必须知道的销售技巧(四),Drive Train,A DC motor with an integral gear reduction and speed controller was used A sprocket set having a 6:1 gear ratio developed required torque,矾诊勺疟隅家株览拯着烃稚宗州皮酮拯迪恐嗣
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