公开(公告)号：US3718065A

公开(公告)日：1973-02-27

申请号：US3718065D

申请日：1970-12-24

Applicant: IIT RES INST

Inventor： LIBER T

IPC: F16B31/02 ,  G01B11/16 ,  G01L5/24 ,  G01D21/00

CPC classification number: G01B11/18 ,  F16B31/02 ,  G01L5/24

Abstract: A bolt having a shank and integral head has a strip of photoelastic material mounted in the head for manifesting in the form of photoelastic fringes linearly related to bolt tension the bending stresses created in the head during loading of the bolt. To determine the tension in the bolt during or after loading, polarized light is directed toward the photoelastic strip and reflected light from the strip is analyzed to measure fringe order. The fringe order is related to the amount of bending stresses in the head of the bolt by a predetermined calibration curve, the bending stresses being linearly related to bolt tension.

Abstract translation: 具有柄和整体头部的螺栓具有安装在头部中的光弹性材料条，以呈现与在螺栓加载期间在头部产生的弯曲应力的螺栓张力线性相关的光弹性条纹的形式。 为了确定在装载期间或装载后螺栓的张力，偏振光被引向光弹性带，并且分析来自条带的反射光以测量条纹顺序。 边缘顺序通过预定的校准曲线与螺栓头部中的弯曲应力的量相关，弯曲应力与螺栓张力线性相关。

公开(公告)号：US3823639A

公开(公告)日：1974-07-16

申请号：US30905372

申请日：1972-11-24

Applicant: IIT RES INST

Inventor： LIBER T

IPC: F16B31/02 ,  G01B11/16 ,  G01L1/24 ,  G01D21/00

CPC classification number: F16B31/025 ,  G01B11/18 ,  G01L1/241

Abstract: Fasteners such as mine bolts are provided with tension indicators to directly read tension in the shank of the bolt. The preferred tension indicators comprise an elongated pin disposed in a bore formed in the bolt and connected at the bottom of the bore to the bolt shank to be tensioned thereby. The tension indicator further comprises a cross bar attached to the other end of the pin and extending laterally into engagement with another portion of the bolt, such as the head of the bolt, to be bent upon tensioning of the pin. Preferably, a photoelastic member is attached to the cross bar and bending stresses in the cross bar are manifested in the photoelastic member in the form of photoelastic fringes for reading by a reflection polariscope.

Abstract translation: 紧固件（如矿用螺栓）设有张力指示器，可直接读取螺栓柄部的张力。 优选的张力指示器包括设置在形成在螺栓中的孔中的细长销，并且在孔的底部连接到螺栓柄以由此被张紧。 张力指示器还包括附接到销的另一端并横向延伸成与螺栓的另一部分（例如螺栓的头部）接合的横杆，以在销的张紧时弯曲。 优选地，光弹性构件附接到横杆，并且横杆中的弯曲应力以光弹性条纹的形式表现在光弹性构件中，用于由反射偏振镜读取。