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장기간 상용한 Cr-Mo 강의 피로강도향상 방법에 관한 연구
진영준 한국산업안전학회 2001 한국안전학회지 Vol.16 No.2
For the purpose of healing the on pert, CO₂ laser beam was irradiated with different irradiation condition(power, diameter, velocity and beam type) to find out optimum irradiation condition. The test series of hardness, residual stress measurement, and fatigue were carried out after the irradiation. Experimental results show that micro-hardness values on the surface of the irradiated specimens were approximately 2.5 times higher than those of un-irradiated ones. Fatigue tests show that the fatigue life was improved by the compressive residual stress after laser beam irradiation. However, some specimens with different conditions show the shorter fatigue life. It means that laser beam irradiation with optimum irradiation condition and optimum absorb energy, Q can improve the fatigue strength.
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고출력 Erbium 첨가 광섬유 광원을 사용하는 자이로스코프에서 광원 과잉잡음의 소거
진영준,박태용,박희갑 한국광학회 1999 한국광학회지 Vol.10 No.5
고출력 erbium 첨가 광섬유 광원을 이용하는 광섬유 자이로스코프에서 측정감도를 개선하기 위하여 신호처리를 통해 자이로의 출력단에서 출력신호에 포함된 광원의 과잉잡음 성분을 소거하였다. 진폭 1.8rad으로 변조된 자이로의 잡음 스펙트럼을 측정한 결과, 본 논문의 방식으로 과잉잡음을 소거한 경우가 소거하지 않은 경우에 비해서 잡음이 13.5dB 감소하였다. 또한, 회전에 따른 자이로 출력을 측정한 결과, 불규칙잡음 계수가 1/4∼1/5 정도로 감소하였다. In the fiber-optic gyroscope employing a high-power erbium-doped fiber source, the source excess noise was subtracted from the gyro output through a single processing to improve the gyroscope sensitivity. As the result, we obtained the reduction of noise by 13.5 dB (electrical) which was measured from the noise floor spectrum when the gyro was modulated with the depth of 1.8 rad. In addition, the random walk coefficient of the gyro output was reduced by a factor of 4~5.
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2¼Cr-1Mo 열화재의 피로균열 진전특성과 수명예측에 관한 연구
秦榮浚 忠州大學校 1997 한국교통대학교 논문집 Vol.32 No.1
In the case of the life prediction of structures and machines after long service, it is natural to consider degradation problems. Most of degradation data from practical structures are isolated data obtained at the time of periodical inspection or repair. From such data, it may be difficult to compose the degradation curve available and necessary for the life prediction. In this paper, the fatigue crack Initiation, growth and coalescence stages of the small crack are displayed on photograph and measured by the crack length and density.
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진영준 忠州大學校 2009 한국교통대학교 논문집 Vol.44 No.-
It is well known that the pipeline is environment-friendly, providing the safest transporting system along with its highest transporting capacity for oil and gas. However, an old pipeline system is easily threatened by several damage factors jeopardizing their oil and gas transporting reliability and structural healthiness. Especially, corrosion takes a great part in damaging gas and oil pipelines. The purpose of the present study, therefore, was to evaluate the expected life span of corrosion damaged pipelines through the FEM interpretation and compare it with that of ASME B31G. Results showed that ASME B31G and ASME B31G modify interpretations revealed about 3~4Mpa over protection in the ratio of damaged depth and thickness compared to FEM interpretation when the external corrosion of damaged X-65 pipelines was formed.
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秦榮浚 忠州大學校 1996 한국교통대학교 논문집 Vol.31 No.1
The strength evaluation of the machines and the structures has been rapidly developed together with the introduction and developing of fracture mechanics. In this paper, for4 the purpose of statistical life prediction, fatigue test was conducted under the 3 stress levels, and for each stress level, about 20 specimens are used. The statistical properties of crack growth parameter m and C in the fatigue crack growth law of da/dN=C(??K)??, and the relationship between m and C, and the statistical distribution pattern of fatigue crack growth rate can be obtained by experimental results.
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秦榮俊 충주대학교 산업과학기술연구소 2002 産業科學論文集 Vol.10 No.-
In this paper, surface crack growth characteristics and influence of the stress amplitude in rotary bending fatigue test were evaluated for annealed S35C steel, and then fractal dimensions of fatigue crack paths estimated using the box counting method. The following results that will be helpful to understand the fatigue crack growth mechanism were obtained. Firstly, crack growth rate ds/dN and db/dN (s:half crack length at the surface crack, b : crack depth) turn out to depend on stress amplitude (△σ/2), stress intensity factor range (△K_A, △K_C) and crack length. Secondly, at the effect area of 0.3 mm hole notch (s<0.5 mm) crack growth rate was found not to depend on these factors.
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진영준 忠州大學校 2007 한국교통대학교 논문집 Vol.42 No.-
It is well known that pipelines have the highest capacity and are the safest and least environmentally disruptive form of transporting oil and gas. However, pipeline damage caused by both internal and external corrosion is a major concern threatening the reliability of oil and gas transportation and the soundness of the pipeline structure. In this study, we estimate the allowable damage by comparing the ASTM B31G code to a modified theory considering diverse detailed corrosive forms. The ASTM B31G code has been developed as the evaluation method for reliability and incident prevention of damaged pipelines based on the amount of loss due to corrosion and the yield strength of materials. Furthermore, we suggest a method for estimating the expected life span of used pipelines by utilizing the reliability method based on major variables such as the depth and length of damage and the corrosion rate affecting the life expectancy of the pipelines.
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진영준 충주대 산업과학기술연구소 1999 産業科學論文集 Vol.7 No.1
Degradation problem due to long term service in machine or structure is now one of important problems in whole industrial field. In this study, pressure vessel steel, Cr-Mo steel, which was used more than 60,000 hours, was surface-modified by laser beam irradiation for the improvement of fatigue strength. To find out optimum irradiation condition, hardness, residual stress measurement and fatigue tests were carried out with the specimen of different irradiation conditions. Experimental results show that micro-hardness values on the surface of the irradiated specimens were approximately 2.5 times higher than those of un-irradiated ones. In the depth direction of the specimen, hardness on the surface showed maximum value and was decreased at the inside the specimen. Different hardness values are due to the energy density Q which was absorbed by the specimen. Fatigue tests show that fatigue life was improved by the compressive residual stress after laser beam irradiation. However, some specimens with differednt conditions show the shorter fatigue life. It means that laser beam irradiation with optimum parameter can improve the fatigue strength.
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