摘要:

The Hon. Secretary of the British Society for Strain Measurement wishes to point out that the dates of some of the BSSM meetings in the Diary are provisional and that further meetings may be announced in some regions. Firmer details will be available in due course from the BSSM office. 281 Heaton Road, Newcastle–upon–Tyne NE6 SQB (Tel: 0632 655273) or from the regional organisers indicated in the Di

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1975.tb00122.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

To protect vibrating wire gauges against damage from construction work and weather, a cover has been designed which permits access to the gauge for manual and automatic readings and which does not interfere with gauge performance. The protected gauges have been used to measure strains on steel plates and stiffeners forming the diaphragm, webs and flanges of the box girder of the Milford Haven Bridge. 94 of the 100 gauges installed were still operating satisfactorily after 16 months use in very adverse conditions.

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1975.tb00123.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

The electro–plating technique of stress analysis involves the use of copper–plated specimens and measurements are based on the appearance of grains grown in the plated copper as a result of cyclic loading. A description is given of the technique and its application to the determination of stress concentration factors for grooves and fillets on circular shafts subjected to torsion. Results are compared with corresponding published values obtained by other meth

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1975.tb00124.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

In the embedded strain gauge technique, the use of miniature gauges with very thin copper leads minimises reinforcing effect on the model. The technique. in this form, was applied to the investigation of three–dimensional strain distributions. Suitability of the method was assessed by determining the mechanical properties of epoxy resin from strains measured in cylindrical and rectangular models subjected to uniaxial tension and in a rectangular beam model subjected to pure bending. The central portion of the beam was subsequently perforated with a triangular array of holes to simulate the geometry of a heat exchanger tube plate. Strains in the ligaments were then measured for various ligament efficiencies, with the model under bending and under tensio

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1975.tb00125.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

A limitation on the use of normal moiré technique may be the practical difficulties which can be encountered on coating the resist layers for the production of etched gratings. A description is given of a simple coating method which can be applied to any testpiece and which requires only a brush and some skill on the part of the operator.The method can also be used to coat resist layers suitable for the production of high frequency gratings of more than 1 000 lines/mm (25400 lines/in)

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1975.tb00126.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

This article demonstrates the accuracy and convenience of a recently developed analytical technique for determining the stress and displacement fields for plane problems from point‐wise photoelastic data and finite order, polynomial approximations of complex potentials of the Kolosoff type. The order of the approximations is consistent with the assumption of a stress field which varies essentially in a quadratic manner within each region or subregion in which the approximations are fitted to the photoelastic data.The theoretical basis of the technique is reviewed briefly and the method is then applied to the problems of an end‐loaded cantilever, a ring and a disc under diametral compression, and a vertical point load on a half‐space. Uncertainties associated with inevitable errors in experimental data are avoided by generating isoclinic and isochromatic data from the theoretical solutions of the four problems, these ‘photoelastic results’ then forming the basic initial data upon which the technique operates.Computations of the stresses, rotations and displacements indicate that the complex potentials method is equally applicable along lines of symmetry, on contours around point loads, in regions where the stress is predominantly uniaxial in character, and also where the stress field is completely two‐dimensional. The computed and theoretical values are virtually in exact agreement whenever the density of the randomly distributed data points is such that the stress field is accurately approximated by a quadratic function within the region spanned by the data points. The local approximations of the potentials are fitted to the experimental results at these

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1975.tb00127.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1975.tb00128.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1975.tb00129.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1975.tb00130.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1975.tb00131.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY