Test method torsion

Cutwater, J. O., Murphy, M. C., Kumble, R. G. Berry, J. T. (1974). Double torsion techniques as a universal fracture toughness test method. Fracture Toughness and Slow-Stable Cracking, ASTM Special Technical Publication 559, pp. 121-31, American Society for Testing and Materials. 

ISO 11003-1 2001 Adhesives - Determination of shear behaviour of structural adhesives -Part 1 Torsion test method using butt-bonded hollow cylinders ISO 11003-2 2001 Adhesives - Determination of shear behaviour of structural adhesives -Part 2 Tensile test method using thick adherents ISO 13445 2003 Adhesives - Determination of shear strength of adhesive bonds between rigid substrates by the block-shear method... 

ISO 11003-1 2001 Adhesives - Determination of shear behaviour of structural adhesives -Part 1 Torsion test method using butt-bonded hollow cylinders... 

Two-in. multiaxial (axial/torsional/intemal pressure) composite tube test method [43]... 

In-Plane Shear Properties. The basic lamina in-plane shear stiffness and strength is characterized using a unidirectional hoop-wound (90°) 0.1 -m nominal internal diameter tube that is loaded in torsion. The test method has been standardized under the ASTM D5448 test method for in-plane shear properties of unidirectional fiber-resin composite cylinders. D5448 provides the specimen and hardware geometry necessary to conduct the test. The lamina in-plane shear curve is typically very nonlinear [51]. The test yields the lamina s in-plane shear strength, t12, in-plane shear strain at failure, y12, and in-plane chord shear modulus, G12. 

The same test method, although not standardized, can be used to characterize the laminate in-plane shear behavior. This is accomplished by winding a multiorientation (hoop/helical and/or helical only) tube. Other test methods that can be used to measure in-plane shear stiffhess/strength of filament wound composites are discussed by Tamopol skii and Kinds [45]. These methods include schemes for torsion of intact rings and split rings. Both of these ring test methods are used to evaluate the in-plane shear modulii G0r and G0z for a filament-wound laminate. 

Before considering particular test methods, it is useful to survey the principles and terms used in dynamic testing. There are basically two classes of dynamic motion, free vibration in which the test piece is set into oscillation and the amplitude allowed to decay due to damping in the system, and forced vibration in which the oscillation is maintained by external means. These are illustrated in Figure 9.1 together with a subdivision of forced vibration in which the test piece is subjected to a series of half-cycles. The two classes could be sub-divided in a number of ways, for example forced vibration machines may operate at resonance or away from resonance. Wave propagation (e.g. ultrasonics) is a form of forced vibration method and rebound resilience is a simple unforced method consisting of one half-cycle. The most common type of free vibration apparatus is the torsion pendulum. 

Further work will be focusing on lifetime prediction methods for gas turbine materials (superalloys) and experiments on fracture mechanics in superalloys as well as finite element calculations of multiaxial loaded tubes and validation of multiaxial tests (tension, torsion, internal pressure). 

Atkinson, B. K. 1979b. Fracture toughness of Tennessee sandstone and Carrara marble using double torsion testing method, Int. J. Rock Mech. Min. Sci. Geomech. Abstr., 16, pp.49-53. 

ISO3046/IV Reciprocating internal combustion engines Performance. Part 1 Specifications for standard reference conditions and declarations of power, fuel consumption and lubricating oil consumption. Part 2 Test methods Part 3 Specification of test measurements. Part 4 Speed governing. Part 5 Torsional vibrations. Part 6 Specifications for overspeed protection. Part 7 Specifications for codes for engine power. 

The main torsional test method is the Clash and Berg test standardized in ISO 458. Parts I [156] and 2 [157], which are dual numbered in BS 2782 as Methods 153A [158] and B [159]. ASTM D1043 [160] is technically equivalent to Part 1. 

Of course, such dynamic mechanical test methods are only suitable for such probes as can support their own weight. In examining paints, lacquers, and non-self-supporting films, a glass fiber cord is impregnated with a solution of the test material and the solvent is evaporated. The impregnated cord is then subjected to periodic oscillations (torsional braid analysis). 

Alternative geometries and test methods to determine the fracture toughness of ceramics and hard materials have been developed over the last decades Herzian indentation [88], the double torsion test [89], and compact tension tests [90 92]. 

ASTM D1043-02 Standard Test Method for Stiffness Properties of Plastics as a Function of Temperature by Means of a Torsion Test... 

This test method determines again the complex modulus (G ) and the phase angle (8), but using torsion rectangular geometry on a DSR to prismatic specimens. The test is specified by ASTM D 7552 (2009). 

D5279-95 Standard Test Method for Measuring the Dynamic Mechanical Properties of Plastics in Torsion D5592-94 Standard Guide for Material Properties Needed in Engineering Design Using Plastics... 

Standard Test Method for Dynamic Mechanical Properties of Plastics by Metals of a Torsional Pendulum... 

D5279-01 Standard Test Method for Plastics Dynamic Mechanical Properties In Torsion... 

Part 1 Torsion test method using butt-bonded hollow cylinders. 

ASTM D1043, Standard test method for stiffness properties of plastics as a function of temperature by means of torsion test, 2002. 

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