巻号一覧
10 巻 (1984)
- 4 号 p. 145-
- 3 号 p. 97-
- 2 号 p. 51-
- 1 号 p. 1-
10 巻, 4 号
選択された号の論文の6件中1～6を表示しています
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秋浜 繁幸1984 年 10 巻 4 号 p. 145-151
発行日: 1984/10/31
公開日: 2009/08/11
ジャーナル フリーPDF形式でダウンロード (8784K) -
国谷 啓一, 荒川 英夫1984 年 10 巻 4 号 p. 152-156
発行日: 1984/10/31
公開日: 2009/08/11
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小沢 喜仁, 関根 英樹1984 年 10 巻 4 号 p. 157-162
発行日: 1984/10/31
公開日: 2009/08/11
ジャーナル フリーThe interfacial debonding is observed in the earliest stage of damage in dispersed composite materials. The crack initiation into a matrix from the ends of partially debonded surfaces of dispersed inclusions plays an important role in the estimation of strength of dispersed composite materials. The criteria discussed in this paper are as follows : (1) the maximum hoop stress criterion, (2) the minimum strainenergy density criterion, (3) the maximum energy-release-rate criterion and (4) the maximum principal stress criterion. These criteria were based on the singular stress field at the ends of debonded surfaces. Tension tests were performed by using epoxy resin specimens containing a flat steel inclusion. By examining the experimental results, it was found that (1) the maximum hoop stress criterion, (2) the minimum strain-energy density criterion and (4) the maximum principal stress criterion are appropriate as the criteria for crack initiation when the matrix is subjected to tensile stress in the direction of the flat inclusion. However the maximum energy-release-rate criterion is invalid.抄録全体を表示PDF形式でダウンロード (5125K) -
鈴木 惠, 中西 博, 岩本 正治, 荒木 栄敏, 宗村 了, 中西 晟1984 年 10 巻 4 号 p. 163-170
発行日: 1984/10/31
公開日: 2009/08/11
ジャーナル フリーThe method to determine the stable crack initiation point of R-RIM polyurethane by three point bending test is proposed and the value of crack tip opening displacement at this point is studied by using the relation between the rotational factor and the crack tip displacement with a concept of fracture mechanics. The critical crack tip opening displacement can be confirmed by continuous observation of the crack blunting and the following stable crack growth processes. It is found that critical value for specimen with the fiber weight content of ten percent is larger than that of zero percent, and the critical value for specimen with void content of sixteen percent is larger than those of three and ten percent. The results can be explained by an increase of the deformation in resin part due to the fiber reinforcement at the crack tip and the ductile deformation in resin part between the notch and the voids.抄録全体を表示PDF形式でダウンロード (8683K) -
福田 武人, 藤井 太一1984 年 10 巻 4 号 p. 171-178
発行日: 1984/10/31
公開日: 2009/08/11
ジャーナル フリーA desk-top computer (what we call a personal computer) system was on-line used connecting a conventional material testing machine to evaluate the low-cycle fatigue response of glass-mat FRP. During the fatigue test, the strain behavior can be monitored by a large-strain gage put between layers when the specimen is made by the hand lay-up method. As a test result, the fatigue damage of the specimens under high stress levels of 90-75% of the static tensile strength can he characterized by the fact that the ratio of the plastic strain to the total strain increases approximately linearly with the logarithm of the repeated cycle. Using such an information of the computer monitoring, the prediction test of the cycle to failure of the specimen was carried out by on-line use of the computer system. The prediction results were compared with the experimental data. In addition, the fatigue life of the mat FRP in the low-cycle region of less than 200 cycles was evaluated by applying a statistical approach based on the Weibull distribution. The statistical analysis shows that the dispersion of the fatigue life is remarkably large and larger for the higher applied stress level, while the dispersion of the static tensile strength of the specimen is comparatively small.抄録全体を表示PDF形式でダウンロード (5546K) -
1984 年 10 巻 4 号 p. 180-182
発行日: 1984/10/31
公開日: 2010/02/08
ジャーナル フリーPDF形式でダウンロード (469K)
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