A series of fatigue tests has been conducted to clarify the fracture behavior depending on the stacking sequences of quasiisotropic
CFRP laminates. Strips of laminate with four different directions were cut out from the same CFRP plate to prepare the
specimens with the four stacking sequences. Prior to fatigue tests, the specimens were collided by a lateral load in order to
simulate the damage induced by the fallen tools. During the fatigue tests, the damage developed in the specimen was detected
by non-destructive techniques such a scanning acoustic microscope (SAM) and a replicating method. Stacking sequences exerted
an influence on fracture behavior of laminate specimens, i.e., the stacking position of the zero degree layers, in which fiber
direction was parallel to the loading axis, played an important role in the fatigue process. When the zero degree layers were
located at the specimen surface, no remarkable damage progress was observed from the surface. On the other hand, when the
zero degree layers were located in the middle of laminates, the damage in the surface layer was found in the fatigue process. Not
only the degradation of the equivalent elastic modulus was seen in all specimens, but also the degradation curve varied with the
Fatigue bending tests on Ni-Ti super elastic wire have been conducted. In order to examine fatigue
fracture behavior in the human body condition, three types of conditions were tested; under dripping cold water,
warm water and laboratory air. The curvature of specimen was calculated with specified maximum strain and
specimen was loaded with cyclic vending deformation using handcrafted fatigue testing machine. As testing results,
the number of cycles to failure decreased with increasing maximum strain under every environmental condition.
Under the warm dripping water conditions, fatigue limit stress seemed to larger than that of under cold drip and
laboratory air conditions. The number of cycles to failure varied slower than with maximum strain under the warm
water condition than cold water and laboratory air conditions. In the fractured surface, dimensions of cleavage
fractured area became smaller with increasing maximum strain. The variation range of in under dripping warm
water was smaller than laboratory air and cold water conditions.
It is well known that the alluvial has its natural period in relation to its depth, and makes the earthquake motion large. On the
other hand, the hill also has its natural period in relation to its height. I this paper, the natural period of a hill is calculated in
consideration of its sectional shape. As a result, The height and the sectional shape of a hill influences its natural period. But
the natural period is proportional to the height of a hill. The mode analysis of the hill at Aobayama Campus of Tohoku
University shows that the natural periods (from 1st till 4th) by 3D model are about 1.0 sec. The natural period by 2D model
is also 0.92 sec. There are many predominant periods under the 1st natural period of 3D model in the calculated response
spectra. And there is no tendency among response spectrum at each point on the 3D model.
We have made some proposals for the educational method of fundamental mathematics in the
college of technology. One aim of the present paper is to state these proposals. In order to
give lessons of fundamental mathematics by our own method, it is desirable for the students to
be given the textbooks for the method. Moreover, we think that the textbooks on the market
are insufficient in some respects to counter the problems in the mathematics education in the
college of technology. We want textbooks to contain detailed explanation, a lot of examples, and
suitable problems, so that a student can study by himself to some degree. For these reasons, we
have been making the teaching handouts for the students in the lower classes of the college of
technology. The other aim of the present paper is to report on these teaching handouts.
The aim of this study was to evaluate the attempt of project-based-learning (PBL) with the industry-academia
collaboration (IAC) in physical education-related liberal arts classes. Sixteen technical college students in an
advanced course took part in this attempt and answered the questionnaire. As an attempt at initiating IAC, we used
a rubber sensor which was developed by Sumitomo Riko Company Limited for measuring body pressure.
Company representatives explained to students the development process and the handling method. Students were
divided into five groups. Subsequently, each group formed 6 weeks’ exercise training (6ET) plan and an
inspection method using the rubber sensor. Based on the data before and after 6ET, each group prepared a
presentation file. Finally, each group performed the presentation and exchanged opinions with company
representatives about the fine points and the other uses of the sensor. Approximately 80% of the students had a
favorable opinion of this attempt. From the present results, it was suggested that this attempt was a worthwhile
class for technical students.