公开(公告)号：US4580520A

公开(公告)日：1986-04-08

申请号：US667262

申请日：1984-11-01

Applicant: Michel Archer

Inventor： Michel Archer

IPC: G01N3/32 ,  G01B5/30 ,  G01L1/06 ,  G01N3/06 ,  G01N19/08

CPC classification number: G01L1/06 ,  G01B5/30 ,  G01N3/06

Abstract: The invention relates to a fatigue indicator for mechanical parts subjected to repeated stresses, which comprises two thick elements spaced apart from one another and joined together by a thin web having a slit, these two elements being incorporated in the part or fixed thereto so as to move with respect to one another upon application of stress on the mechanical part in a plane which is parallel to the plane of the web, the thin web being thus subjected to a shearing stress in its plane, and wherein the slit of the thin web extends from one of the edges of the web in the direction of relative movement to a blind end so that, when the part is stressed, two cracks appear from corners of the blind end of the slit, extend progressively in the web and finish by reaching the opposite edge of the web or joining cracks coming from this opposite edge, the web thus being detached or practically detached.

Abstract translation: 本发明涉及一种经受重复应力的机械部件的疲劳指示器，其包括彼此间隔开的两个厚元件，并通过具有狭缝的薄腹板连接在一起，这两个元件结合在部件中或固定在其上，以便 在平行于腹板的平面的平面上施加应力时，相对于彼此移动，因此薄腹板在其平面中受到剪切应力，并且其中薄腹板的狭缝延伸 从幅材的相对运动方向的一个边缘到盲端，使得当零件受到应力时，在狭缝的盲端的拐角处出现两个裂缝，在网中逐渐延伸并通过到达 纤维网的相对边缘或接合来自该相对边缘的裂纹，因此，网状物被分离或实际上分离。

公开(公告)号：US4502337A

公开(公告)日：1985-03-05

申请号：US480403

申请日：1983-03-30

Applicant: Michel Archer

Inventor： Michel Archer

IPC: G01N3/32 ,  G01B5/30 ,  G01N3/06 ,  G01N19/08

CPC classification number: G01N3/062 ,  G01B5/30 ,  G01N2203/0066

Abstract: The present invention relates to an improved fatigue damage indicator for aechanical member subjected to repetitive stress, comprising two thick elements which are spaced from one another and are connected one to the other by a thin web or plate formed with a slot and at least one pair of free opposite edges, the two elements being so connected with the mechanical member or fixed to the latter so that they are displaceable relative to one another in a plane parallel to the plane of the thin plate, the thick elements being disposed so as to be separated from one another in a direction substantially perpendicular to their direction of relative displacement by such stress, the thin plate being placed under shear force in its plane by such relative displacement, the slot of the thin plate extending from one of the edges of the web in the said direction and terminating short of the opposite edge in a blind end of the slot having two corners so that, with application of stress, two cracks develop at corners of the bottom of the crack and are propagated progressively in the web towards an opposite edge of the thin plate so that said cracks meet cracks propagating generally in a direction away from said opposite edge to detach, or substantially detach, a central zone of the thin plate delimited by said cracks, wherein the thick elements of the fatigue damage indicator are connected to each other not only by thin webs but in addition by two narrow, elongated struts disposed on either side of the web and directed perpendicularly to the axis of one or the two slots in this web.

Abstract translation: 本发明涉及一种用于经受重复应力的机械构件的改进的疲劳损伤指示器，包括彼此间隔开的两个厚元件，并且通过形成有槽的薄腹板或板彼此连接，并且至少一个 一对自由的相对边缘，两个元件与机械构件如此连接或固定到后者，使得它们在平行于薄板平面的平面中相对于彼此移动，该厚元件设置成 通过这种应力在与其相对位移方向基本垂直的方向上彼此分离，薄板通过这种相对位移在其平面中的剪切力下放置，薄板的狭槽从 在所述方向上的腹板并且在具有两个角的狭槽的盲端中终止于相对边缘的短边，使得在施加应力时，存在两个裂纹 在裂纹的底部的角落处发展并且在幅材中朝向薄板的相对边缘逐渐传播，使得所述裂纹遇到通常沿远离所述相对边缘的方向传播的裂纹，以分离或基本上分离中心区 的薄板，其中疲劳损伤指示器的厚元件不仅通过薄腹板彼此连接，而且还通过设置在腹板的任一侧上并且垂直于轴线指向的两个狭窄的细长支柱相互连接 在这个网页中的一个或两个插槽。

公开(公告)号：US4409841A

公开(公告)日：1983-10-18

申请号：US221212

申请日：1980-12-30

Applicant: Michel Archer

Inventor： Michel Archer

IPC: G01N3/32 ,  G01B5/30 ,  G01L1/06 ,  G01N3/06 ,  G01B11/20 ,  G01L5/00 ,  G01N3/00 ,  G01N19/00

CPC classification number: G01B5/30 ,  G01L1/06 ,  G01N3/062 ,  G01N2203/0066

Abstract: A fatigue damage indicator includes a thin plate mounted between or integral with two members to which a stress is to be applied, the disposition of the two members being such that the thin plate is stressed in shear.Slots extending in the direction of the applied stress may be provided to ensure that cracks formed by fatigue stress propagate in a desired direction and the crack propagation is designed to ensure that a part of the plate becomes detached or is bent substantially away.

Abstract translation: 疲劳损伤指示器包括安装在两个构件之间或与要施加应力的两个构件成一体的薄板，两个构件的布置使得薄板在剪切中受到应力。 可以提供在施加的应力方向上延伸的槽，以确保由疲劳应力形成的裂纹在期望的方向上传播，并且裂纹扩展被设计成确保板的一部分脱落或基本上远离弯曲。