Strength longitudinal

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. 

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... 

The next type of joint is weld overlays, which are often utilized to eliminate the need for costly thrust blocks [Fig. 4-2(p)]. In designing the pipe an analysis was made to ensure that it possessed sufficient longitudinal strength. It makes sense, then, to make the weld joints be at least as strong as the longitudinal strength of the pipe rather than just as an internal pressure-seal pipe. 

Figure 2.9 Tensile test for one-ply composite Exfieriment experiments (3 representative samples) and FEA the simulalion results. The model has the following feamres o-FVF = 44%, iy-FVF = 74.5%, inter-yam matrix layer is 20 pm. The transverse strength is assumed to be 40 MPa, the longitudinal strength is 1280 MPa at 60% FVF. The local stress is used to predict...

High modulus melt-spun PE from Hoechst Celanese Certran has a modulus of about 40 GPa (common unreinforced engineering TPs have a modulus in the range 2.3 to 3 GPa) showed a longitudinal modulus of 37 GPa for imidirectional fiber and 110 MPa longitudinal strength, a transverse modulus of 3.9 GPa and transverse strength 28 MPa. The process continues to be applied to all melt-spun fibers. 

Hence for the purposes of the EUROCOMP Design Code it is assumed that the strain to failure of the fibres is smaller than that of the matrix and that the matrix can support no load once the fibres reach their failure strain. Therefore Equation (4.58) of the EUROCOMP Design Code is taken as a conservative estimate of the longitudinal strength of the composite. 

The longitudinal strength of unidirectional conqrosites are relatively independent of the sp ific reinforcement... 

A conveyor belt is a long narrow slab of material, designed to hold material with sufficient longitudinal strength to withstand the pull of its drive under load. 

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