KR950002158Y1 - Double jig on pre-crack generation - Google Patents

Double jig on pre-crack generation Download PDF

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KR950002158Y1
KR950002158Y1 KR2019910016178U KR910016178U KR950002158Y1 KR 950002158 Y1 KR950002158 Y1 KR 950002158Y1 KR 2019910016178 U KR2019910016178 U KR 2019910016178U KR 910016178 U KR910016178 U KR 910016178U KR 950002158 Y1 KR950002158 Y1 KR 950002158Y1
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jig
test
crack
test piece
test pieces
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KR930009339U (en
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김주학
김기철
최광
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포항종합제철 주식회사
정명식
재단법인 산업과학기술연구소
백덕현
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/04—Chucks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0032—Generation of the force using mechanical means
    • G01N2203/0039—Hammer or pendulum
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0067—Fracture or rupture

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

내용 없음.No content.

Description

프리크랙 발생용 복식지그Double Jig for Free Crack Generation

제1도는 본 고안에 따른 복식지그를 도사한 측단면도.Figure 1 is a side cross-sectional view of the double jig according to the present invention.

제2도는 제1도의 A-A'선 단면도.2 is a cross-sectional view taken along the line AA ′ of FIG. 1.

제3도는 종래 기술에 따른 단식 지그를 도시한 측단면도.Figure 3 is a side cross-sectional view showing a single jig according to the prior art.

제4도의 a)는 샤르피형 계장화 충격시험편의 제작과정을 도시한 설명도. b)는 균열개구 변위 시험편의 제작과정을 도시한 설명도이다.Figure 4 a) is an explanatory diagram showing the manufacturing process of the Charpy instrumented impact test piece. b) is an explanatory diagram showing the manufacturing process of the crack opening displacement specimen.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 복식지그 10,10' : 받침지그1: Doubles jig 10,10 ': Base jig

30 : 중간지그 40,40' : 제1및 제2시험편30: intermediate jig 40,40 ': first and second test pieces

50 : 가설지그 100 : 단식지그50: temporary jig 100: fasting jig

본 고안은 통상의 파괴 인성시험시 필요한 시험편 조건중에서 노치(Notch) 선단에 피로형 프리크랙(Fatigue Pre-Crack)(이하, 프리크랙이라 한다)을 발생시키기 위한 지그에 관한 것으로, 보다 상세히는 제작시간을 단축시켜 시험편 제작 생산성을 향상시키도록 된 프리크랙(Pre-Crack)발생용 복식지그에 관한 것이다.The present invention relates to a jig for generating a fatigue pre-crack (hereinafter referred to as a pre-crack) at the tip of a notch among test specimen conditions necessary for a normal fracture toughness test. The present invention relates to a pre-cracking double jig for shortening the time and improving productivity of the test piece production.

일반적으로 파괴인성시험은 정적인(Static) 시험과 동적인(Dynamic)시험으로 대분되는데, 정적인 시험으로는 제4도의 b)에 도시된 균열개구변위(Crack opeing displacement, 보통 COD로 약기) 시험 등이 있고 동적인 시험방법으로는 제4도의 a)에 도시된 샤르피형 계장화 충격시험법(Charpy type instrumented impact test)이 최근 각광을 받고 있다. 여기서 샤르피형 계장화충격시험법이란 기존의 샤르피형 충격 시험기에 고속하중측정장치와 변위(혹은 시간) 측정장치를 장착하여 이로부터 검출된 파형을 해석하는 방법으로 그 경제성과 간편성으로 인해 동적파괴인성 등의 동축성 해석에 많이 이용되고 있다.Generally, the fracture toughness test is divided into a static test and a dynamic test. The static test is a crack opeing displacement (abbreviated as COD) test shown in b) of FIG. As a dynamic test method, the Charpy type instrumented impact test shown in a) of FIG. 4 has recently been in the spotlight. Here, Charpy-type instrumentation shock test method is a method that analyzes the waveform detected from the existing Charpy-type impact tester with high speed load measuring device and displacement (or time) measuring device. It is widely used for coaxial analysis.

상기 각각의 시험방법은 모두 3점 굽힘형태의 하중조건을 갖추고, 제4도에 도시된 바와같이(11)은 노치를(12)는 하중 방향을, (13)은 노치선단에 각각 발생된 프리크랙(Pre-Crack)을 나타내고 있다. 상기와 같이 샤르피형 충격 시험편이나 균열개구변위 시험편의 제작을 위해서는 지금까지 제3도에 도시된 단식지그를 사용하여 왔다. 상기 단식지그(100)에서 (101)는 상부축 지그(102)는 하부축지그, 그리고(103)은 샤르피형 충격시험편 혹은 균열개구변위 시험편을 나타내고 있다. 3점 굽힘 형태의 시험편에 있어서는 상부측 지그와 하부측 지그 사이에 압축 피로하중이 주어지며, 그리하여 (11)의 노치선단에 (13)과 같은 프리크랙을 발생시켜 본 실험에 임하게 된다.Each test method has a three-point bending condition, and as shown in FIG. 4, reference numeral 11 denotes the notch 12 in the load direction, and 13 denotes a free edge generated at the notch tip. Cracks (Pre-Crack) are shown. As described above, the single jig shown in FIG. 3 has been used for the production of the Charpy impact specimen or the crack opening displacement specimen. In the single fastener jig 100, reference numeral 101 denotes an upper shaft jig 102, a lower shaft jig, and 103, a Charpy impact test piece or a crack opening displacement test piece. In the three-point bend test specimen, a compressive fatigue load is applied between the upper jig and the lower jig, and thus, the precrack as shown in (13) is generated at the notch end of (11) and is subjected to this test.

그러나 상기와 같은 파괴인성 시험에 있어서 인성치는 시험온도의 함수로 보통 3-4구간 혹은 5-6구간 이상의 온도범위가 주어지며, 각각의 온도범위에서 일반적으로 3회 이상의 시험을 하여 인성치르 구한다. 따라서 같은 종류의 시험편이 다수 필요하며 경우에 따라서는 십여개 내지 수십개 요구되는 때도 많다. 한편, 하나의 시험편에 프리크랙을 발생시키기 위해서는 대상재료에 따라 하중범위 및 분당 반복수가 설정되기 때문에 보통 30분에서 한 시간 혹은 그 이상의 시간이 요구되며, 따라서 그만큼 많은 작업시간이 필요하게 되어 시험편 제작에 생산성이 저하되는 것이었다.However, in the fracture toughness test, the toughness is usually given as a function of the test temperature and is given a temperature range of 3-4 sections or more than 5-6 sections, and the toughness value is generally obtained by performing three or more tests in each temperature range. Therefore, many specimens of the same kind are needed and in some cases dozens or dozens are required. On the other hand, in order to generate a pre-crack in one test piece, the load range and the number of repetitions per minute are usually set according to the target material, and thus 30 minutes to an hour or more is required. The productivity was lowered.

본 고안은 상기와 같은 문제점을 해소하기 위하여 안출된 것으로서 시험편의 제작조건을 충분히 만족시키면서 제작시간을 50%이상 단축시켜 시험편 제작에 효율성을 향상시키도록 된 프리크랙 발생용 복직시그를 제공함에 목적이 있다.The present invention was devised to solve the above problems, and the object of the present invention is to provide a recovery crack for precrack generation to improve the efficiency of the test piece by reducing the manufacturing time by 50% or more while sufficiently satisfying the test conditions of the test piece. have.

상기 목적을 달성하기 위하여 본 고안은, 시험편의 양축단부를 압압하는 한쌍의 대향된 받침지그 ; 상기 받침지그의 사이에 위치된 복수개의 시험편 사이에 삽입되어 상기 시험편의 배면 중앙부를 지지하는 중간지그 ; 를 포함한 프리크랙 발생용 복식지그를 마련함에 의한다.In order to achieve the above object, the present invention, a pair of opposed support jig for pressing both ends of the test piece; An intermediate jig inserted between a plurality of test pieces positioned between the supporting jig to support a rear center portion of the test piece; By providing a double jig for precrack generation including a.

이하,도면을 참조하여 본 고안을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to the drawings.

본 고안의 복식지그(1)는 한쌍의 대향된 받침지그(10)(10')와, 상기 받침지그(10)(10') 사이에 위치된 중간지그(30)와의 관련 구성으로 된다.The double jig 1 of the present invention has a related configuration with a pair of opposed supporting jigs 10, 10 ′ and an intermediate jig 30 positioned between the supporting jigs 10, 10 ′.

상기 각각의 받침지그(10)(10')는 제1 및 제2시험편(40)(40')의 양측단부를 압압하는 돌기(10a)(10a')를 갖는 형상으로서 제3도에 도시된 종래 기술에 따른 하부측 지그(102)와 동일형상을 갖추고 있다. 한편, 중간지그(30)는 제2도에 도시된 바와같이 원통형 몸체부(31)를 갖추고 상기 몸체부(31)의 중간부분에는 직경이 축소된 단면축소부(32)를 갖추고 있다.Each of the supporting jigs 10 and 10 'has protrusions 10a and 10a' for pressing both end portions of the first and second test pieces 40 and 40 ', as shown in FIG. It has the same shape as the lower side jig 102 according to the prior art. On the other hand, the intermediate jig 30 has a cylindrical body portion 31 as shown in Figure 2 and the middle portion of the body portion 31 is provided with a cross-sectional reduction portion 32 of reduced diameter.

상기 단면축소부(32)는 직경이 동일한 원통형의 형상을 갖추고 제1 및 제2시험편(40)(40')의 폭에 해당하는 길이를 갖추고 있다. 미설명 부호(11)는 시험편(40)(40')의 노치이다.The cross-sectional reduction portion 32 has a cylindrical shape having the same diameter and has a length corresponding to the width of the first and second test pieces 40 and 40 '. Reference numeral 11 is a notch of the test piece 40 (40 ').

상기와 같이 구성된 본 고안은, 하부의 받침지그(10') 위에 하나의 제2시험편(40')을 위치시키고, 상기 제2시험편(40')상부에 중간지그(30)의 단면축소부(32)를 위치시키며, 상기 중간지그(30)상부에 다른 하나의 제1시험편(40)을 위치시킨 다음, 상부의 받침지그(10)로서 상기 제1시험편(40)의 양측단부를 압압하도록 장착된다. 이때, 상기 제1 및 2시험편(40)(40')의 설치형태는 , 노치(11)가 형성된 전면부(40a)(40a')가 각각 받침지그(10)(10')를 향하도록 위치하고, 각각의 제1 및 제2시험편(40)(40')의 배면부(40b)(40b')는 각각 중앙부분이 중간지그(30)의 단면축소부(32)에 면접(面接)하도록 된다. 또한 , 상기 중간지그(30)에 제1시험편(40)을 설치할때는, 상기 단면축소부(32)의 직경과 동일한 높이를 갖춘 가설지그(假說 Jig)(50)를 이동하여 상기 중간지그(30)의 양측에 위치시켜 제1시험편(40)을 고정시킨 다음, 상부의 받침지그(10)로서 제1시험편(40)의 양측단부를 약간 압압한 상태에서 상기 가설지그(50)를 제거하면 된다. 이때, 상기 가설지그(50)를 고무제품과도 같은 탄성력을 갖춘 재료로서 구성하면 용이하게 제거할 수 있게 된다.According to the present invention configured as described above, the second test piece 40 'is positioned on the lower support jig 10' and the cross-sectional reduction part of the intermediate jig 30 is placed on the second test piece 40 '. 32), and the other first test piece 40 is placed on the middle jig 30, and then mounted to press both ends of the first test piece 40 as an upper support jig 10. do. At this time, the installation forms of the first and second test pieces 40, 40 'are positioned such that the front portions 40a, 40a', on which the notches 11 are formed, face the supporting jigs 10, 10 ', respectively. The back portions 40b and 40b 'of the first and second test pieces 40 and 40', respectively, have their center portions interviewed with the end face reduction portions 32 of the intermediate jig 30, respectively. In addition, when the first test piece 40 is installed in the intermediate jig 30, the temporary jig 50 having the same height as the diameter of the cross-sectional reduction part 32 is moved to the intermediate jig 30. The first test piece 40 is fixed to both sides of the c), and then the temporary jig 50 is removed while slightly pressing both end portions of the first test piece 40 as the upper supporting jig 10. . At this time, if the temporary jig 50 is configured as a material having an elastic force, such as a rubber product can be easily removed.

상기와 같이 제1 및 제2시험편(40)(40')이 본 고안의 복식지그(1)에 장착된 상태에서 프리크랙이 형성되는 경우, 각각의 받침지그(10)(10')는 제1 및 제2시험편(40)(40')의 양측단부를 눌러주게 되고, 상기 제1 및 제2시험편(40)(40') 사이에 위치된 중간지그(30)는 제1 및 제2시험편(40)(40')의 배면중앙부를 눌러주게 되어 각각의 제1 및 제2시험편(40)(40')의 노치(11)에서 프리크랙(Pre-Crack)이 발생하게 된다.As described above, when the pre-cracks are formed while the first and second test pieces 40 and 40 'are mounted on the double-sided jig 1 of the present invention, each of the supporting jigs 10 and 10' Both ends of the first and second test pieces 40 and 40 'are pressed, and the intermediate jig 30 positioned between the first and second test pieces 40 and 40' is provided as the first and second test pieces. Pre-Crack is generated at the notches 11 of the first and second test pieces 40 and 40 ', respectively, by pressing the back center portion of the 40 and 40'.

따라서, 제1 및 제2시험편(40)(40')의 동시에 제작되게 되어 하나의 시험편에 대한 제작시간이 현저히 단축되게 된다.Therefore, the first and second test pieces 40 and 40 'are manufactured at the same time, so that the production time for one test piece is significantly shortened.

간혹, 제1 및 제2시험편에 프리크랙의 발생길이가 약간 다르게 발생할 수는 있으나 이는 파괴 인성실험과정에서 프리크랙의 길이와 시험편폭과의 비율이 변수로 주어지기 때문에 시험편의 제작에는 아무런 영향도 주지 않게된다.Occasionally, the length of the precrack may occur slightly differently in the first and second specimens, but this has no effect on the fabrication of the specimen because the ratio of the length of the crack to the specimen width is given as a variable during the fracture toughness test. Will not give.

따라서, 본 고안안에 의하면 한번의 작업으로 두개의 시험편을 일시에 제작할 수 있기 때문에 단위 시험편당 프리크랙을 발생시키는 제작시간이 현저히 단축되어 생산성 향상 효과가 얻어지게 된다.Therefore, according to the present invention, since two test pieces can be produced at one time by one operation, the production time for generating pre-crack per unit test piece is remarkably shortened, thereby improving productivity.

Claims (1)

동적 파괴인성등을 평가하기 위한 샤르피형 계장파 충격시험과, 정적파괴인성을 평가하기위한 균열 개구 변위 시험용 시험편을 제작하는 지그에 있어서, 제1 및 제2시험편(40)(40')의 양측단부를 압압하는 한쌍의 대향된 받침지그(10)(10') ; 상기 받침지그(10)(10')의 사이에 위치된 제1 및 제2시험편(40)(40')사이에 삽입되어 상기 제1 및 제2시험편(40)(40')의 배면 중앙부를 지지하는 중간지그(30) ; 를 포함함을 특징으로 하는 프리크랙 발생용 복식지그.Both sides of the first and second test pieces 40, 40 'in a jig for producing a Charpy instrumentation wave impact test for evaluating dynamic fracture toughness and the like, and a test piece for crack opening displacement test for evaluating static fracture toughness. A pair of opposed supporting jigs 10, 10 'for pressing the ends; It is inserted between the first and second test pieces 40 and 40 'positioned between the supporting jigs 10 and 10', so that the center portion of the rear surface of the first and second test pieces 40 and 40 'is positioned. Intermediate jig 30 for supporting; Double jig for generating a pre-crack, characterized in that it comprises a.
KR2019910016178U 1991-10-01 1991-10-01 Double jig on pre-crack generation KR950002158Y1 (en)

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Publication number Priority date Publication date Assignee Title
KR101347623B1 (en) * 2012-04-13 2014-01-09 한국세라믹기술원 Measuring method of precrack of ceramic body

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CN113720668B (en) * 2021-09-22 2024-02-13 安徽理工大学 Device for manufacturing frozen soil dynamic fracture toughness sample

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101347623B1 (en) * 2012-04-13 2014-01-09 한국세라믹기술원 Measuring method of precrack of ceramic body

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