KR950012063A - Determination of fracture toughness by uniaxial tensile test - Google Patents

Determination of fracture toughness by uniaxial tensile test Download PDF

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Publication number
KR950012063A
KR950012063A KR1019930021839A KR930021839A KR950012063A KR 950012063 A KR950012063 A KR 950012063A KR 1019930021839 A KR1019930021839 A KR 1019930021839A KR 930021839 A KR930021839 A KR 930021839A KR 950012063 A KR950012063 A KR 950012063A
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South Korea
Prior art keywords
tensile test
present
calculating
fracture toughness
fracture
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KR1019930021839A
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Korean (ko)
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오흥국
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오흥국
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Priority to KR1019930021839A priority Critical patent/KR950012063A/en
Publication of KR950012063A publication Critical patent/KR950012063A/en

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Abstract

본 발명의 기술분야는 재료의 기계적 성질 규명 및 그 시험법에 관한 것으로서 해결하려고 하는 기술적 과제는 현재의 파괴인성의 측정방법인 ASTM E399는 시험편 준비가 대단히 어렵고 측정치도 안정되지 못하였는데, 본 발명은 시험하기게 간편하고 안정된 측정치를 주는 인장시험을 이용하여 측정하는 것임.The technical field of the present invention relates to the identification of mechanical properties of materials and test methods thereof, and the technical problem to be solved is that ASTM E399, which is a measure of fracture toughness, is very difficult to prepare specimens and the measured values are not stable. It is measured using a tensile test that gives a simple and stable measurement.

본 발명의 혜결의 요지는 재료의 정적수명 방정식을 이용하여 작은 Al간(dt)동안에 이미 지나간 수명분을 계산하고 이것을 재료의 평생동안 적분하는 바식을 인장시험에 적용하여 탄소성재료의 파괴면의 단위면적당 표면 에너지를 구한 결과, 완전취성파괴의 단위면적당 표면에너지에다 인장시험시 파단점의 연신율과 인장강도에서의 탄성 변형율과의 비를 곱한 것과 같다는 것을 발명하였음.Summary of the Invention The benefit of the present invention is the calculation of the life span of the carbonaceous material by applying a bar equation that calculates the life span already passed during the small Al period (dt) using the static life equation of the material and integrating it over the lifetime of the material. As a result of determining the surface energy per unit area, the inventors invented that the surface energy per unit area of complete brittle fracture is multiplied by the ratio of the elongation at break at the tensile test to the elastic strain at tensile strength.

본 발명의 중요한 용도는 파괴인성을 구하는 획기적인 쉽고 정확한 방법일 뿐만 아니라 신소재의 버그백터를 구하거나 파괴역학 및 압력용기 구조역학 계산시 응력강도계수의 계산에 계산시간을 획기적으로 단출시킬 수 있음.An important use of the present invention is not only a breakthrough easy and accurate method of obtaining fracture toughness, but also a short time to calculate the stress intensity factor when calculating the bug vector of the new material or calculating the fracture dynamics and the pressure vessel structural dynamics.

Description

단축인당 시험에 의한 파괴인성의 결정법Determination of Fracture Toughness by Shortening Per Capita Test

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1 도는 4340풀림 열처리강의 인장시험곡선.1 is a tensile test curve of 4340 annealing steel.

Claims (4)

본문에서와 같이 인장시험결과에 의하여 (1)식, (2)식, 혹은 (3)식에 의하여 면적당 표면에너지를 계산하여 파괴인성을 구하는 방법.Method of obtaining fracture toughness by calculating surface energy per area by equation (1), (2) or (3) according to the tensile test results as in the main text. 2파괴역학 및 압력용기 구조역학 계산에서 응력강도계수(K1)을 구하는데 있어서 본 발명의 (1)식에서 f대신에 계산하려고 하는 위치에서의 인장시험 그래프에서의 해당 응력 점의 시간 s를 사용하여 (1)식을 계산하고 응력강도계수를 계산하는 방법 및 기타 본 발명의 (1)식, (2)식, 혹은 (3)식 및 s를 사용하여 응력강도계수 K1을 계산하거나 그 원리를 이용하여 공학계산 및 측정수단으로 사용하는 것.(2) In the equation (1) of the present invention in obtaining the stress intensity factor (K 1 ) the time of the corresponding stress point in the tensile test graph at the position to be calculated instead of f Calculate Eq. (1) using s and stress intensity factor And other formulas (1), (2), or (3) of the present invention Calculate the stress intensity factor K 1 using s or use it as a means of engineering calculation and measurement using the principle. 신재료의 버그벡터를 모를 경우 ASTM E399시험과 본 발명에 의한 인장시험에 의한 방법을 동시에 시행하여 그 재료의 버그벡터를 계산하는 법.If the bug vector of the new material is not known, the method of calculating the bug vector of the material by simultaneously performing the method according to the ASTM E399 test and the tensile test of the present invention. 본 발명의 다른 실시에 (3)항에서 설명한 인장시험과 평균응력이 다른 경우의 연신율, 단위면적당 표면에너지 및 파괴인장계산하는 방법.A method for calculating elongation, surface energy per unit area, and fracture tensile strength when the tensile test described in (3) is different from another embodiment of the present invention. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930021839A 1993-10-18 1993-10-18 Determination of fracture toughness by uniaxial tensile test KR950012063A (en)

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KR1019930021839A KR950012063A (en) 1993-10-18 1993-10-18 Determination of fracture toughness by uniaxial tensile test

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100697222B1 (en) * 2005-09-02 2007-03-22 한국건설기술연구원 Apparatus and method for testing rockbolt

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100697222B1 (en) * 2005-09-02 2007-03-22 한국건설기술연구원 Apparatus and method for testing rockbolt

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