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AA6061-T6의 NaCl 수용액중에서의 S.C.C.연구
배동호,최용식 成均館大學校 科學技術硏究所 1983 論文集 Vol.34 No.1
Stress corrosion cracking may be defined as the spontaneous failure of a metal resulting from the combined effect of corrosion and stress. Particularly, under the specific corrosive environments contained chloride and sulphide, high strength steels and alloys are very susceptible to stress corrosion cracking. Accordingly, in this investigation, the stress corrosion cracking characteristics in the aluminum alloy AA6061-T6 sheet for the various percents NaCl solution environments wens studied. Experiments were conducted with the symmetric double edge cracked specimens at 80℃ and the various percentages of 5%, 10%, 15% and 20% in experimental room temperature. In order to accelerate the tests, 0.35% H_2O_2 was added to the NaCl solutions. The results obtained are as follows: (1) AA6061-T6 sheet in 5%, 10%, 15% and 20% NaCl solutions at 80℃, S.C.C. was occurred and according to rise the percents of NaCl solutions, incubation period was delayed and the crack growth rats was accelerated. In all cases, the crack propagation in the directions approximately perpendicular to the applied tensile stress. (2) S.C.C. behaviors in rte Log d(2a)/dt vs. K_1 relation curves provide a full representation ion I , region II and region III. (3) K_1S. c.c. value is defined around 39kg·mm^-3/2 for the AA6061-T6 sheet. (4) K_1c value is defined around 50kg·mm^-3/2 for the AA6061-T6 sheet. (5) The relation of d(2a)/dt vs. K_1 for region II is as follows: d(2a)/dt = C·10^mk1. The value of constant m is found 8.19 x 10 exp(-2).
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배동호,신정남,고기환 한국낙농학회 1994 韓國酪農學會誌 Vol.16 No.4
경북지역에서 생산된 사과박을 착유우 TMR의 38.7%로 이용했을 때 사료섭취량, 젖생산량, 유조성분 등에 미치는 영향을 알기 위하여 관행 사료를 대조구로 한 60일간의 사양시험을 실시하였다. 최고 비유기가 지난 Holstein 12두를 2구로 나누어 완전 임의 배치하였다. 사과박-TMR을 급여한 젖소의 진물 섭취량은 21.8㎏으로서 대조구의 16.5㎏에 비하여 32% 증가(P<.01)했으며, 젖생산량은 사과박-TMR 급여구가 22.4㎏으로서 대조구의 19.7㎏에 비하여 13.8%증가(P<.01)하였다. 유단백질 함량은 사과박-TMR구가 뚜렷이 증가(P<.01)했으나 유당의 함량은 감소(P<.01)했다. 유지방과 무지고형분(SNF)함량은 시험 구간에 차이 (P>.05)가 없었다. 사과박 TMR을 급여한 구의 체중은 대조구에 비하여 증가(P<.05)하였으며, 젖 ㎏ 생산당 사료비는 사과박-TMR을 급여한 것이 많이 소요되었으나, 생산된 총 유대에서 총 사료비를 제한 조수익은 사과박-TMR급여구가 많았다. Twelve Holstein milking cows were used to determine the effect of the total mixed ration that was formulated with fresh apple pomace(AP-TMR) as a major ingredient(39%, as fed basis) on dry matter intake, milk yield and milk chemical composition. AP-TMR was compared to conventional feeds (control). Dry matter intake and milk yield of the cows fed AP-TMR increased(P<.01) 32% and 13.8%, respectively, compared to those fed control diet. The dry matter intake and milk yield of the AP-TMR were 21.8㎏ and 22.4㎏, respectively. The cows fed AP-TMR increased (P<.01) their milk protein content, but decreased (P<.01) their lactose content in milk, compared to those of the control. The milk fat content and solids-non-fat in milk showed no significant differences(P>.05) with treatments. The body weight gain increased in the cows fed AP-TMR compared to that of the control. The feed cost per ㎏ milk production was higher with AP-TMR, but the gross income (caculated as total milk cost minus total feed cost) was higher with AP-TMR than the control.
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배동호,장윤환 한국축산학회 1971 한국축산학회지 Vol.13 No.2
To investigate the digestion coefficients and digestible nutrients of 18 different domestic feedstuffs the digestion experiments were carried out with sheep and the comparisons with foreign data were also attempted.
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