ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1978.tb00257.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

The design, construction and calibration of a five‐component dynamometer is described. The dynamometer was constructed primarily for the testing of ship control surfaces including, in particular, skeg rudders; it has facilities for the independent adjustment of angle of attack, and the derivation of the forces and moments, on both rudder and skeg.An outline of the specialised design requirements is given. The basic design concept is described together with the reasons for the choice of shear flexures and their dimensions, strain gauges, circuits, bridge voltages and instrumentation. Following a brief description of the calibration rig and programme, the calibration results and origins of interactions are described and discussed.It is concluded that the relatively small size of the interaction corrections and overall measuring accuracy of the dynamometer confirm the choice of the overall design concept and design detail

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1978.tb00258.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

Tension relaxation tests are made on composite flat belt drive materials under simulated drive conditions. A non‐linear equation is obtained relating belt tension at time t to the initial tension at time t=0. The parameters in the equation are evaluated using a non‐linear estimation computer program. Differentiation of the equation enables the time to be predicted when the rate of change of relaxation of the material becomes insignific

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1978.tb00259.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

The modulus of elasticity E of metals and alloys varies, usually, when the ambient temperature θ changes, which is a drawback in most metro logic applications. A thermoelastic coefficient TCE equal to (ΔE/Δθ)/E can be defined. This article shows how this quantity can be measured, dynamometrically and statically, with safety and precision, on a metallic specimen, made of the material under study, on which strain gauges with a known thermal coefficient TCK are bonded.Experiments carried out at the ONERA Modane‐Avrieux Centre during the manufacture of more than one hundred dynamometers, made of several kinds of metals and gauges, showed that the TCKs, given by the gauge manufacturer, were more stable than the TCEs, which justifies a sufficiently fine measurement of the latter. The TCE values of six different materials, lying between ‐0.44×103and + 0.33×103, have been determined to within 0.02×10‐3without particular precautions. An absolute precision better than 0.01×10‐3may be obtained by this process, which also makes it possible to determine the modulus of elasticity E and the Po

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1978.tb00260.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1978.tb00261.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

Book reviewed in this article:Fracture Mechanics in Engineering Practice Editor P. StanleyBall and Roller Bearings by P. S. Houghton

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1978.tb00262.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1978.tb00263.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1978.tb00264.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1978.tb00265.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1978.tb00266.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY