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    • 71. 发明授权
    • Method and apparatus for accurate measurement of impact fracture behavior
    • 用于精确测量冲击断裂行为的方法和装置
    • US5770791A
    • 1998-06-23
    • US663917
    • 1996-06-14
    • Michael Peter Manahan, Sr.
    • Michael Peter Manahan, Sr.
    • G01H1/12G01N3/00G01N3/02G01N3/06G01N3/303G01H7/00G01N3/30G01N3/32
    • G01N3/303G01H1/12G01N2203/001G01N2203/0039G01N2203/0098G01N2203/021G01N2203/0222G01N2203/0242G01N2203/027G01N2203/0623G01N2203/0676
    • Methods and apparatus for the accurate determination of impact fracture behavior of materials. Test specimens are thermally preconditioned in-situ by flowing a thermally conditioned gas over the surfaces of the specimen which contain the volume of material near the notch and/or precrack which influences the fracture properties. Upper shelf energy is determined using miniature specimens which is quantitatively equivalent to the upper shelf energy which would have been obtained using conventional ASTM E 23 specimens. Percent shear fracture area and lateral expansion are measured using a computerized image capture system to reproduce a digitized image of the fracture surface on a computer which is then quantitatively analyzed. A high frequency response load cell, consisting in part of two active strain gages installed near the center of percussion on the tapered portion of an impact striker, well within one stress wavelength of the striking surface, is used to measure the force-time curve. Balancing resistors are used to complete a Wheatstone bride circuit and these balancing resistors are not mounted on the striker to avoid sensing reflected stress waves. The instrumented striker is calibrated after it is installed in the test machine by placing a calibrated load cell and a hydraulic jack within a load reaction frame which surrounds the instrumented striker, calibrated load cell, and hydraulic jack.
    • 准确测定材料冲击断裂行为的方法和装置。 通过将受热调节的气体流过试样的表面,使试样在原料附近进行热预处理,该气体表面含有影响断裂性能的缺口附近的材料体积和/或预处理。 使用微型样品确定上架能量,该样品定量地等同于使用常规ASTM E 23试样获得的上架能量。 使用计算机化图像捕获系统测量剪切断裂面积和横向膨胀百分比,以再现定量分析计算机上的断裂面的数字化图像。 一个高频响应称重传感器,用于测量力 - 时间曲线,该高频响应称重传感器由冲击撞击器锥形部分附近安装在冲击中心附近的两个有源应变计的一部分组成。 平衡电阻用于完成惠斯登电梯的新娘电路,并且这些平衡电阻器不会安装在撞针上,以避免感测反射的应力波。 仪表化的撞针在安装在试验机中后,通过将校准的称重传感器和液压千斤顶放置在围绕仪表撞击器,校准称重传感器和液压千斤顶的负载反作用架内进行校准。
    • 72. 发明授权
    • Shock testing apparatus
    • 冲击试验装置
    • US5003811A
    • 1991-04-02
    • US345098
    • 1989-04-28
    • Leland K. ShannonTed L. GentryToby Le
    • Leland K. ShannonTed L. GentryToby Le
    • G01N3/00G01N3/30
    • G01N3/30G01N2203/0039
    • A shock testing apparatus for simulating pyrotechnic shocks comprises an elongate bar suspended for movement in a longitudinal direction, and a pendulum hammer suspended for impact with one end of the bar to excite it into longitudinal resonance. A mounting assembly at the opposite end of the bar allows test components to be mounted in three perpendicular x, y and z orientations relative to the bar. A reversible drive motor raises the hammer to a predetermined height under the control of a control assembly which switches off the motor to allow release of the hammer when the predetermined height is reached. Damping masses are clamped at pre-selected positions along the bar to produce a predetermined shock response spectrum on impact with the hammer.
    • 用于模拟烟火冲击的冲击测试装置包括悬挂用于在纵向方向上运动的细长杆和悬挂用于与杆的一端冲击以将其激发成纵向共振的摆锤。 在杆的相对端的安装组件允许测试部件相对于杆以三个垂直的x,y和z取向安装。 可逆驱动电动机在控制组件的控制下将锤子提升到预定高度,该控制组件在达到预定高度时关闭电动机以允许释放锤子。 阻尼块在沿着杆的预选位置处夹紧,以在与锤撞击时产生预定的冲击响应谱。