Plastic limit

Borden, Inc. (Borden Chemicals Plastics Limited Partnership) Geismar, La. 

But at the present it (Bridgman s work) increases the presumption that the discontinuity in the shock wave is to be explained by something else. The whole question of what causes such discontinuities seems to be somewhat obscure. It is apparently recognized that such a phenomena as reaching the plastic limit may explain the discontinuity at 10,(X)0 (kg/cm ) mentioned above, but the precise mechanism by which reaching the plastic flow point may induce the discontinuity seems not to have been worked out. 

Physical properties involve tests of the physical index parameters of the materials. For spent foundry sand, these parameters include particle gradation, unit weight, specific density, moisture content, adsorption, hydraulic conductivity, clay content, plastic limit, and plastic index. These parameters determine the suitability of spent foundry sand for uses in potential applications. Typical physical properties of spent green foundry sand are listed in Table 4.5. 

Plastic limit/plastic index Nonplastic AASHTO T90/ASTM D4318... 

A cavity s maximum storage capacity is almost proportional to its Maximum Allowable Operating Pressure (MAOP). MAOP is fixed by tightness considerations, which in theory at least, are based on the impermeability (and plasticity limit) of the salt rock to hydrocarbons when pressure remains lower than stresses equal to the weight of the overburden (approximately 0.023 MPa per meter depth). 

Fig. 3. Two-dimensional representation of Covalent bond potential energy curve. Subdivided into three regions Elastic region where the curve is symmetric with respect to Ro, Plastic region where the curve is asymmetric and affect only on the side of R greater than the yield stress. Beyond plastic limit the atoms physically breaks away...

A group of (originally) seven limits of soil consistency, or relative ease with which material can be deformed or made to flow. The only Atterberg limits that are still in common use are the liquid limit, plastic limit, and plasticity number. 

Suspension films separating two solid surfaces, and Wetting films separating a solid or liquid from a vapour. The minimum water content for which a small sample of soil or similar material will barely flow in a standardized test method. Also termed the upper plastic limit . See also Atterberg Limits, Plastic Limit, Plasticity Number. Light non-aqueous phase liquid. See Non-aqueous Phase Liquid. 

The difference between the liquid limit and the plasticity limit of a soil or similar material. Also termed the plasticity index . See also Atterberg Limits, Liquid Limit, Plastic Limit. 

Leaflets issued by British Industrial Plastics Limited British Polymer Training Association British Xylonite Company Limited BX Plastics Limited BXL Plastics Limited Colloids Limited Dawe Instruments Limited Grant Spacey Limited Guyson International Limited Linx Printing Technology Limited Lloyd Instruments Limited Newport Corporation R. Simon (Dryers) Limited W. Canning Materials Limited. 

It is assumed that the bending moment applied to the root section of the tube is the plastic limit moment. Let the neutral axis be defined by the angle... 

Thus the longitudinal bending moment at x=0 is to be equal to the plastic limit moment,... 

Atterberg limits Liquid limit Plastic limit Shrinkage limit Soil classification, preliminary indication of behavior such as sensitivity of clays to loss of strength on remolding, and estimate of compressibility of "normally loaded" clays... 

ASTM Method for Liquid Limit, Plastic Limit, and Plasticity Index of Soils (D 4318-83)... 

The ability of lime to convert a highly plastic, sticky soil into a dry workable material, can be illustrated by reference to Fig. 26.1 [26.9]. The plastic limit [26.10] of the original clay is 25 % water. Thus at a moisture content of 35 %, the clay is 10 % above the limit and is very sticky. The addition of 2 % of lime raises the plastic limit of the clay to 40 %. By adding that amount of lime to a clay containing 35 % moisture, the clay would become 5 units of % below the plastic limit. It would, therefore, become drier and crumble easily. This effect is in addition to the drying action of quicklime mentioned above. 

Figure 26.1. Effect of lime addition on the plastic limit of a clay (Crown copyright is reproduced with the permission of the Controller of Her Majesty s Stationery Office)...

---