RU95103415A - Method to determine fatigue crack growth parameters in indestructed member of structure - Google Patents

Method to determine fatigue crack growth parameters in indestructed member of structure

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Publication number
RU95103415A
RU95103415A RU95103415/28A RU95103415A RU95103415A RU 95103415 A RU95103415 A RU 95103415A RU 95103415/28 A RU95103415/28 A RU 95103415/28A RU 95103415 A RU95103415 A RU 95103415A RU 95103415 A RU95103415 A RU 95103415A
Authority
RU
Russia
Prior art keywords
crack
plastic deformation
measured
equivalent
fatigue crack
Prior art date
Application number
RU95103415/28A
Other languages
Russian (ru)
Other versions
RU2087896C1 (en
Inventor
А.А. Шанявский
Е.Ф. Орлов
Original Assignee
Государственный научно-исследовательский институт гражданской авиации
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Государственный научно-исследовательский институт гражданской авиации filed Critical Государственный научно-исследовательский институт гражданской авиации
Priority to RU95103415A priority Critical patent/RU2087896C1/en
Publication of RU95103415A publication Critical patent/RU95103415A/en
Application granted granted Critical
Publication of RU2087896C1 publication Critical patent/RU2087896C1/en

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  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

FIELD: study of materials and their capability to resist to cracks growth depending on their fraction pattern parameters in the form of slant caused by plastic deformation, method is used for estimation of loading of structure members. SUBSTANCE: method provides, that samples are cyclically loaded under different asymmetry of cycles. Values of crack length and slants height caused by plastic deformation are determined and according to their correspondence judgement about equivalent damaging action of loadings is made and dependance between equivalent factor of tension intensity and slant height caused by plastic deformation is determined. On structural member surface, which developed fatigue crack, measurements of space between trace of crack and distant from it boundary of plastic deformation zone are made and simultaneously crack length is measured. About parameters of fatigue crack growth they charge according to single ratio between measured space and equivalent factor of tension intensity using for the purpose measurements of crack length. EFFECT: method allows to estimate structure members loading. 1 cl, 4 dwg

Claims (1)

Изобретение относится к области исследования материалов и определения их способности сопротивления росту трещин по параметрам рельефа излома в виде скосов от пластической деформации и может быть использовано для оценок нагруженности элементов конструкций. Способ заключается в том, что образцы циклически нагружают при разных асимметриях циклов. Определяют значения длины трещин и высоты скосов трещины и высоты скосов от пластической деформации, по соответствию которых судят об эквивалентном повреждающем действии нагрузок и устанавливают связь между эквивалентным коэффициентом интенсивности напряжения и высотой скоса от пластической деформации. В элементе конструкции по поверхности, где выявлена усталостная трещина, проводят измерения расстояния между следом трещины и отстоящей от него границей зоны от пластической деформации и одновременно измеряют длину трещины. О параметрах роста усталостной трещины судят по единому соотношению между измеряемым расстоянием и эквивалентным коэффициентом интенсивности напряжений, используя при этом результаты измерения длины трещины.The invention relates to the field of research of materials and determination of their ability to resist crack growth by fracture relief parameters in the form of bevels from plastic deformation and can be used to assess the loading of structural elements. The method consists in the fact that the samples are cyclically loaded at different asymmetries of the cycles. The values of the length of cracks and the height of the bevels of the crack and the height of the bevels from plastic deformation are determined, according to which the equivalent damaging effect of the loads is judged and the relationship between the equivalent stress intensity factor and the height of the bevel from plastic deformation is established. In a structural element on the surface where a fatigue crack is detected, the distance between the crack trace and the zone boundary distant from plastic deformation is measured and the crack length is measured at the same time. Fatigue crack growth parameters are judged by a single relationship between the measured distance and the equivalent stress intensity factor, using the results of measuring the crack length.
RU95103415A 1995-03-10 1995-03-10 Method determining parameters of growth of fatigue crack in member of structure RU2087896C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU95103415A RU2087896C1 (en) 1995-03-10 1995-03-10 Method determining parameters of growth of fatigue crack in member of structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU95103415A RU2087896C1 (en) 1995-03-10 1995-03-10 Method determining parameters of growth of fatigue crack in member of structure

Publications (2)

Publication Number Publication Date
RU95103415A true RU95103415A (en) 1996-11-27
RU2087896C1 RU2087896C1 (en) 1997-08-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
RU95103415A RU2087896C1 (en) 1995-03-10 1995-03-10 Method determining parameters of growth of fatigue crack in member of structure

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RU (1) RU2087896C1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2469290C1 (en) * 2011-06-14 2012-12-10 Российская Федерация, от имени которой выступает Министерство промышленности и торговли Российской Федерации (Минпромторг России) Method for determining crack growth rate due to cyclic loads
CN110376226B (en) * 2019-07-03 2021-01-08 浙江大学 Method for determining crack propagation characteristics of turbine engine rotor

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Publication number Publication date
RU2087896C1 (en) 1997-08-20

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