Conventional yield strength

Keywords multiwall carbon nanotubes (MWNT), polytetrafluoroethylene (PTFE), surface groups, conventional yield strength, coefficient of elasticity... 

In Fig. 4 there are shown compression plots for composite materials obtained by mixing of PTFE (F-4PN20) and MWNT powders with following hot pressing. The curves 1-3 corresponds to composites containing MWNT with different surface state, 4 - pure PTFE. In Table 3 there are listed conventional yield strength and coefficients of elasticity calculated from compression plots. 

The ultimate goal of assemblies of nanoscale MBBs is to create nanostructures with improved properties and functionality heretofore unavailable to conventional materials and devices. As a result, one should be able to alter and engineer materials with desired properties. For example, ceramics and metals produced through controlled consolidation of their MBBs are shown to possess properties substantially improved and different from materials with coarse microstmctures. Such different and improved properties include greater hardness and higher yield strength in the case of metals and better ductility in the case of ceramic materials [102]. 

One of the advantages to using shape memory alloys is the high level of recoverable plastic strain that can be induced. The maximum recoverable strain these materials can hold without permanent damage is up to 8 % for some alloys (compared with a maximum strain 0.5 % for conventional steels). The yield strength of shape memory alloys is lower than that of conventional steel, but some compositions have a higher yield strength than plastic or aluminum. The yield stress for NiTi can reach up to 500 MPa. 

The tensile strength and yield strength of both as-cast and annealed Pb-0.5 wt% Ag-Ca system alloys were the same or higher in comparison with the conventional Pb-1.0 wt% Ag alloy. The increase in the Ca content in the Pb-0.5 wt% Ag-Ca alloy increased the Vickers hardness of the alloy. The rolling rate increased the hardness of the Pb-0.5 wt% Ag-Ca alloys but after annealing, the hardness decreased. 

Values and units Flexural modulus (MPA) Flexural strength, at rupture (MPa) Flexural strength, at maximum strain (MPa) At conventional deflection which is 1.5 X height therefore 4 mm specimens would have a maximum strain at 3.5%. Tangent modulus (MPa) Secant modulus (MPa) Flexural strength, (at rupture ) (MPa) Flexural yield strength (MPa) Maximum allowable strain in the outer fibers is 0.05 mm/mm. The point where the load does not increase with increased deflection, provided it occurs before the maximum strain rate. 

Figure 12.30. The yield strength of PET/HDPE conventional composite and MRC nersiis processing cycles...

Figure 12.31. Yield strength of pure HDPE, PET/HDPE conventional composite and MRC with different...

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