Strength, longitudinal shear

Strength, longitudinal shear (lap-joint strength)—The force necessary to rupture an adhesive joint by means of stress applied parallel to the plane of the bond. 

BOND STRENGTH Resistance to separation of set grout from other materials with which it is in contact a collective expression for all forces such as adhesion, friction, and longitudinal shear. 

Longitudinal tension and compression moduU Shear modulus In-plane shear modulus Second moment of area Major and minor axis second moments of area Span of simply supported beam Longitudinal tension and compression strengths Longitudinal in-plane shear strength Mid-span deflection Point load Shear stiffness ratio... 

These six coupons were subsequently loaded continously to failure. The ultimate longitudinal shear strengths obtained for each coupon are listed in Table 3. The average longitudinal shear strength is 88.83 N/mm. This value has been derived from a full section test. 

Table 3 Longitudinal shear moduli and strengths of coupons cut from 203x203x9.5 mm WF-section.

The ILSS of a u.d. composite may be calculated by two extreme approaches. The most optimistic estimate for ILSS is obtained by neglecting stress concentrations. Consider a triangular array of fibres that is subject to a longitudinal shear stress equal to the interlaminar shear strength in a horizontal plane. On the assumption that at fracture the horizontal resin bridges between the fibres bear the matrix yield stress X and that an effective fraction a of the fibre surface bears the interface strength x, it can be derived that ... 

Part C5 1990 Determination of bond strength in longitudinal shear. 

The tension and the shear forces in the anchors are transfered to the longitudinal rebars and shear reinforcement, respectively, which will be designed as anchor reinforcement. Therefore, the concrete breakout strength in tension and shear (D.5.2 and D.6.2) is not checked. The concrete pryout strength in shear (D.6.3) is assumed OK by inspection because it is usuaiiy criticai for short and stiff anchors. 

Interlaminar (longitudinal) shear modulus (Git) Longitudinal tensile strength Transverse tensile strength Interlaminar shear strength Longitudinal Poisson s ratio (piO Transverse Poisson s ratio (pj... 

STM strength properties of double-lap shear adhesive joints by tension loading Bond strength in longitudinal shear... 

Xl = longitudinal tensile strength X[ = longitudinal compressive strength Xj = transverse tensile strength Xj = transverse compressive strength S = shear strength... 

The paste-extmsion process includes the incorporation of ca 16—25 wt % of the lubricant (usually a petroleum fraction) the mixture is roUed to obtain uniform lubricant distribution. This wetted powder is shaped into a preform at low pressure (2.0—7.8 MPa or 19—77 atm) which is pushed through a die mounted in the extmder at ambient temperature. The shear stress exerted on the powder during extmsion confers longitudinal strength to the polymer by fibrillation. The lubricant is evaporated and the extmdate is sintered at ca 380°C. 

A strength value associated with a Hugoniot elastic limit can be compared to quasi-static strengths or dynamic strengths observed values at various loading strain rates by the relation of the longitudinal stress component under the shock compression uniaxial strain tensor to the one-dimensional stress tensor. As shown in Sec. 2.3, the longitudinal components of a stress measured in the uniaxial strain condition of shock compression can be expressed in terms of a combination of an isotropic (hydrostatic) component of pressure and its deviatoric or shear stress component. 

X (= axial or longitudinal strength in tension Xg = axial or longitudinal strength in compression Y, = transverse strength in tension Yg = transverse strength in compression S = shear strength... 

Other researchers have substantially advanced the state of the art of fracture mechanics applied to composite materials. Tetelman [6-15] and Corten [6-16] discuss fracture mechanics from the point of view of micromechanics. Sih and Chen [6-17] treat the mixed-mode fracture problem for noncollinear crack propagation. Waddoups, Eisenmann, and Kaminski [6-18] and Konish, Swedlow, and Cruse [6-19] extend the concepts of fracture mechanics to laminates. Impact resistance of unidirectional composites is discussed by Chamis, Hanson, and Serafini [6-20]. They use strain energy and fracture strength concepts along with micromechanics to assess impact resistance in longitudinal, transverse, and shear modes. 

Certain materials may be weak in shear, and for these it is appropriate to measure their strength by torsion tests. For such tests, the material is fabricated into a rod of circular cross-section, and twisted about its longitudinal axis. The angle of twist is proportional to the shearing strain, and the... 

ISO 6721-8 1997 Plastics - Determination of dynamic mechanical properties - Part 8 Longitudinal and shear vibration - Wave-propagation method ISO 6721-10 1999 Plastics - Determination of dynamic mechanical properties - Part 10 Complex shear viscosity using a parallel-plate oscillatory rheometer ISO 9311-2 2002 Adhesives for thermoplastic piping systems - Part 2 Determination of shear strength... 

The [10°] off axis tension specimen shown in Fig 3.23 is another simple specimen similar in geometry to that of the [ 45 ]s tensile test. This test uses a unidirectional laminate with fibers oriented at 10° to the loading direction and the biaxial stress state (i.e. longitudinal, transverse and in-plane shear stresses on the 10° plane) occurs when it is subjected to a uniaxial tension. When this specimen fails under tension, the in-plane shear stress, which is almost uniform through the thickness, is near its critical value and gives the shear strength of the unidirectional fiber composites based on a procedure (Chamis and Sinclair, 1977) similar to the [ 45°]s tensile test. 

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