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1. 发明授权

US5187987A Bending beam creep test device with piston having a gas bearing 失效
标题翻译：具有气体轴承的活塞的弯曲梁蠕变试验装置
公开(公告)号：US5187987A
公开(公告)日：1993-02-23
申请号：US794539
申请日：1991-11-19
申请人： David A. Anderson , John G. Witzel , Don Christensen , Hussain Bahia
发明人： David A. Anderson , John G. Witzel , Don Christensen , Hussain Bahia
IPC分类号： G01N3/00 , G01N3/02 , G01N3/06 , G01N3/20 , G01N33/38
CPC分类号： G01N3/20 , G01N11/00 , G01N2203/0023 , G01N2203/0071 , G01N2203/0222 , G01N2203/0228 , G01N2203/0242 , G01N2203/0258 , G01N2203/0617 , G01N2203/0682 , G01N33/38
摘要： Apparatus is disclosed for measuring creep stiffness of a specimen, for example, asphalt cement, or other viscoelastic material, having a flexural modulus greater than approximately 1,000 psi. The specimen and the lower part of a loading mechanism are submerged in a constant temperature coolant thereby providing buoyant support to the specimen, preventing it from deflecting under its own weight, as well as providing means for controlling the test temperature. The coolant temperature is maintained to within approximately +/-0.1.degree. C. of a desired temperature. The specimen, having known dimensions, is supported within the coolant on two spaced apart support members. A loading head actuated by an air bearing/pneumatic piston mechanism engages the specimen midway between the two support members. The deflection of the specimen is measured with an LVDT and the load imparted to the specimen by a load cell provided under at least one of the specimen support members. In order to prevent the buildup of frost on the apparatus, those components which extend from the air into the coolant are composed of low conductive material such as polymethylmethacrylate.
摘要翻译：公开了用于测量样品的蠕变刚度的装置，例如具有大于约1,000psi的挠曲模量的沥青胶泥或其它粘弹性材料。试样和装载机构的下部浸没在恒温冷却剂中，从而为试样提供浮力支撑，防止其在自重下偏转，以及提供控制试验温度的装置。将冷却剂温度保持在所需温度的大约+/- 0.1℃内。具有已知尺寸的样品在两个间隔开的支撑构件内的冷却剂内支撑。由空气轴承/气动活塞机构致动的装载头在两个支撑构件之间的中间接合试样。用LVDT测量试样的偏转，并且通过设置在至少一个试样支撑构件下的测力传感器赋予试样的载荷。为了防止装置上霜的积聚，从空气向冷却剂中延伸的部件由聚甲基丙烯酸甲酯等低导电性材料构成。

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