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표면처리에 따른 알루미늄 5052-H34 합금 적층재의 방탄성능에 관한 연구
손세원 건국대학교 산업기술연구원 2001 건국기술연구논문지 Vol.26 No.-
In order to investigate the fracture behaviors(penetration modes) and the resistance to penetration during ballistic impact of Al 5052-H34 alloy, cold-rolled Al 5052 H34 alloy laminates, anodized Al 5052 H34 alloy laminates, and anodized Al 5052 H34 alloy after cold-rolling, ballistic testing was conducted. In general, superior armor material is brittle materials which have a high hardness. Ballistic resistance of these materials was measured by protection ballistic limit(V50), a statical velocity with 50% probability for incomplete penetration. Fracture behaviors and ballistic tolerance, described by penetration modes, are observed respectfully, resulting from V50 test and Projectile Through Plates (PTP) test at velocities greater than V50. PTP tests were conducted with 0˚ obliquity at room temperature using 5.56mm ball projectile. V50 tests with 0˚ obliquity at room temperature were also conducted with projectiles that were able to achieve near or complete penetration during PTP tests. Surface Hardness, resistance to penetration, and penetration modes of Al 5052-H34 alloy, Al 5052 H34 alloy laminates compared to those of cold-rolled Al 5052 H34 alloy laminates and anodized Al 5052 H34 alloy laminates and anodized Al 5052 H34 alloy after cold-rolling.
變形硬化를 받는 熔接部의 殘留應力分布에 관한 實驗的 硏究
孫世元 건국대학교 1995 學術誌 Vol.39 No.2
In manufacturing process, the welding is used widely in machine part and structures. But residual stress generated by the welding process cause the deformation, buckling, fatigue, stress corrosion cracking. In this study, the distribution of residual stress caused by welding process of the SM20C, SM30C, Al6061-T651 (Al-Mg-Si) and CV graphite cast iron was studied. Also the relaxation of residual stress by using the prestrain and prestress was studied.
용융아연도금한 SB 41강판의 피로파괴거동에 관한 연구
손세원,김영준 건국대학교 산업기술연구원 2001 건국기술연구논문지 Vol.26 No.-
U-Band with is used to hang a transformer at concrete pole is made by SB 41steel and it was plated hot dipping galvanization at 465℃ to Prevent corrosion, but in spite of hot dipping galvanization, U-Band should be changed to new one every 10~15 years because of corrosion. In this study, 5 standard CCT specimens were prepared by hot dipping galvanization respectively. By using tension test and fatigue test, mechanical properties and fatigue crack propagation behavior has been examined In an SB 41steel plate, 440℃ hot dipping galvanized SB 41steel plate and 495℃ hut dipping galvanized SB 41 steel plate to compare 465℃ hot dipping galvanized SB 41steel plate being used. The effect of dipping temperature(440℃, 465℃ and 495℃) and heat treatment time(3hr and 9hr) in galvanization are reported.
變形時效硬化를 받은 SM 12C鋼의 加工硬化 指數의 擧動에 關한 硏究
孫世元 建國大學校 附設 産業技術硏究所 1988 논문집 Vol.13 No.-
In this paper, strain age hardening exponent of mild steel plate which was pretreated by prestress and prestrain loading conditions were studied. The variation of the strain age hardening exponent of the test materials is examined in the light of Taylor's work hardening theory. The strain age hardening exponent of the specimens which received cyclic tensile load may be classified into three categories according to the number and type of loads. The first group of the specimens used in these experiment with one, five, ten and thirty cyclic tensile loads respectively, under prestress was found to be correspond to the stage I of Taylor's work hardening theory. The second and third group with applied cyclic tensile load from one to ten and ten to thirty times respectively, under prestrain can be understood to correspond respectively tot he stage Ⅱ and Ⅲ of Taylor's work hardening theory.
冷間壓廷鋼板의 Cyclic Tension에 依한 强度增加에 관한 硏究
孫世元 건국대학교부설 산업기술연구소 1984 논문집 Vol.9 No.-
In this paper, author report that a cold rolled steel plate when applied cyclic tension shows various mechanical properties as follows (1) It was noticed that under the identical treatment the hardness of specimen B was greater than that of specimen A, and the hardness of the specimens showed no sign of changes after 25 days. (2) Residual strain was observed even under the cyclic load which varied from 70% to 90% of the yield point load according to various conditions. (3) If certain period of time passes, after applying cyclic load greater than the yield point-load, upper and lower yield point of the specimen are increased. (4) Yield points of specimen A and B have increased both, particularly the increment of specimen B is much greater than that of specimen A, however the ultimate tensile strength is little affected by the cyclic load.
變形時效硬化를 받는 軟鋼板의 引張破壞 擧動에 關한 硏究
孫世元 건국대학교 부설 산업기술연구소 1985 논문집 Vol.10 No.-
In this paper, author report that mild steel plate influenced by strain age hardening shows various mechanical properties as follows 1) It was noticed that residual strength of mild steel plate influenced by strain age hardening was greater value than that of mild steel plate influenced by stress age hardening 2) In case of mild steel plate influenced by strain age hardening, residual strength of specimen decreased according to the order of 30,5,10 cycles of cyclic tension number. Also, it was found that residual strength of specimen influenced by strain age hardening increased by 18.5%, 16.7% and 13.2% when the cyclic tension number is 30, 5 and 10 respectively compare to that of standard specimen. 3) It was found that net residual strength of standard specimen tend to increase with the crack length, but net residual strength tend to decrease when the crack length reached the certain critical crack length, however the net residual strength of specimen influenced by stress-strain age hardening tend to increase with the crack length according to the decrease of thickness.
The Perforation Behavior of the Anodized Al Light Armor under High Velocity Impact
손세원,이두성,Sung-HeeHong,Hee-JaeKim 한국정밀공학회 2003 International Journal of Precision Engineering and Vol.4 No.4
In order to investigate the effect of surface treatment (Anodizing) and rolling on Al 5083-H131 alloy, under hyper velocity impact, a ballistic testing was conducted. Ballistic resistance of these materials was measured by a protection ballistic limit (V50), a statistical velocity with 50% probability of penetration.Perforation behavior and ballistic tolerance, described by penetration modes, were respectfully observed, by V50 test and Projectile Through Plates (PTP) test at velocities greater than V50.PTP tests were conducted with 0obliquity at room temperature using 5.56mm ball projectiles. V50 tests with 0obliquity were also done with projectiles that were able to achieve near or complete penetration during PTP tests.Resistance to penetration, and penetration modes of Al 5052-H34 alloy were compared to those of Al 5083-H131 alloy.