公开(公告)号：US09851043B2

公开(公告)日：2017-12-26

申请号：US15000889

申请日：2016-01-19

Applicant: Stress Engineering Services, Inc.

Inventor： Richard C. Biel

IPC: F16L55/16 ,  F16L57/02

CPC classification number: F16L57/02

Abstract: A crack arrestor apparatus and method for making same by applying layers of a composite material of non-metallic fibers and resin around a length of pipe; the fibers generally aligned with the pipe circumference. The applied layers have a thicker portion in the middle and a thinner portion on the ends. Part of the pipe covered by the thicker portion is then yielded by application of radial force past the elastic limit of the pipe, thereby creating circumferential tension on the composite. At least a portion of the composite remains in circumferential tension upon release of the radial force. The residual stresses in the yielded metal pipe assist to arrest crack propagation. Thereby, the process to arrest a crack in a metal pipe includes maintaining circumferential tension in a composite residing around the pipe while maintaining compressive circumferential residual stress on the metal pipe covered by the composite.

公开(公告)号：US20160363250A1

公开(公告)日：2016-12-15

申请号：US15000889

申请日：2016-01-19

Applicant: Stress Engineering Services, Inc.

Inventor： Richard C. Biel

IPC: F16L57/02

CPC classification number: F16L57/02

Abstract: A crack arrestor apparatus and method for making same by applying layers of a composite material of non-metallic fibers and resin around a length of pipe; the fibers generally aligned with the pipe circumference. The applied layers have a thicker portion in the middle and a thinner portion on the ends. Part of the pipe covered by the thicker portion is then yielded by application of radial force past the elastic limit of the pipe, thereby creating circumferential tension on the composite. At least a portion of the composite remains in circumferential tension upon release of the radial force. The residual stresses in the yielded metal pipe assist to arrest crack propagation. Thereby, the process to arrest a crack in a metal pipe includes maintaining circumferential tension in a composite residing around the pipe while maintaining compressive circumferential residual stress on the metal pipe covered by the composite.

Abstract translation: 一种防裂器装置及其制造方法，其特征在于，通过在一定长度的管子上施加非金属纤维和树脂的复合材料层; 纤维通常与管圆周对齐。 所施加的层在中间具有较厚部分，并且在端部上具有较薄部分。 然后由较厚部分覆盖的管的一部分通过施加径向力超过管的弹性极限而产生，从而在复合材料上产生周向张力。 当释放径向力时，复合材料的至少一部分保持圆周张力。 屈服金属管中的残余应力有助于阻止裂纹扩展。 因此，在金属管中阻止裂纹的过程包括保持在管周围的复合材料中的周向张力，同时保持由复合材料覆盖的金属管上的压缩圆周残余应力。