Buckling test

Figure 29 Schematic of the Yoshida buckling test. (From Ref. 68.)...

H Abe, K Nakagawa, S Sato. Proposal of conical cup buckling test. Proceedings of the Congress of the International Deep Drawing Research Group, Kyoto, 1981. pp 1-19. 

K Yoshida, H Hayashi, K Miauchi, M Hirata, T Hira, S Ujihara. Yoshida buckling test. Proceedings of the International Symposium on New A.spects of Sheet Metal Forming, 1981, pp 125-148. 

Figure 11 Buckling test load versus out of plane displacements.

Yarn buckling tests were carried out in the FIBRE TETHERS 2000 (1994, 1995) Joint industry project. Failure due to axial compression fatigue was also studied in fibres from fatigued ropes in the study. As discussed below, the constraints on fibres within the yarns, especially if they were re.strained in a shrink-tube in the laboratory te.st or within ropes, causes very sharp fibre kinks to form. Kevlar, Vectran and Dyneema all showed kink-bands within fibres and breaks over short lengths. 

SCFT and BHAT equipment for Plastic Buckling tests were modified and new equipment, CMDT and WFT, will be constructed to perform a distortion test of ducts of a fuel sub-assembly. Then a new R D, which is to investigate the distortion behaviors of internal structures, will be started in near future. 

In the present case the procedure was to try a particular pipe specification in the deformation and buckling test calculations. In the following example a pipe depth of 3.6 m is tried with a 4 bar pipe. 

An alternative approach, used by Turvey and Brooks (1996), involved bonding two small aluminium cantilevers normal to the web of the WF beam. Aluminium rods at the ends of the cantilevers extended for a short distance parallel to the web of the beam. These rods provided the lines of contact for long, PVC shoes placed over the ends of three extensometers (two vertical and one horizontal). Figure 13.18 shows an image of the cantilevers and the transducers with their PVC shoes. The two vertical transducers enabled the vertical deflection and the cross-section rotation to be determined and the horizontal transducer recorded the lateral translation of the beam directly. In later lateral buckling tests an electronic clinometer was also attached either to one of the beam s flanges or to its web to record the cross-section rotation directly. 

In column buckling tests particular care has to be taken with setting up the column s end support conditions and with the axial or eccentric alignment of the end compressive forces. In order to reduce force alignment difficulties, buckling tests are often carried out in universal testing machines with extended daylights. Simply supported end conditions have been simulated in some tests by means of a steel ball located between two thick steel plates, as shown in Fig. 13.20(a). For column tests which require simply supported... 

Turvey G J (1996a), Lateral buckling tests on rectangular cross-section pultruded GRP cantilever beams. Composites B, Vol. 27B, No. 1, pp. 35-42. 

Turvey G J and Brooks R J (1996), Lateral buckling tests on pultruded GRP I-section beams with simply supported-simply supported and clamped-simply supported end conditions. In Proceedings of the 1st International Conference on Composites in Infrastructure (ICCI 96), University of Arizona, Tucson, AZ, pp. 651-664. 

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