Plastic properties determination

It is very important, from one hand, to accept a hypothesis about the material fracture properties before physical model building because general view of TF is going to change depending on mechanical model (brittle, elasto-plastic, visco-elasto-plastic, ete.) of the material. From the other hand, it is necessary to keep in mind that the material response to loads or actions is different depending on the accepted mechanical model because rheological properties of the material determine type of response in time. The most remarkable difference can be observed between brittle materials and materials with explicit plastic properties. 

This book focuses on the relationships between the chemical structure and the related physical characteristics of plastics, which determine appropriate material selection, design, and processing of plastic parts. The book also contains an in-depth presentation of the structure-property relationships of a wide range of plastics, including thermoplastics, thermosets, elastomers, and blends. 

The plastic properties of a material are often determined by an indentation test [28]. Both static and dynamic test methods are available, but all generally determine the pressure necessary to cause permanent and nonrecoverable deformation. 

ISO 14125 2001 Fibre-reinforced plastic composites - Determination of flexural properties... 

CA 49, 10625 (1955) (Structure of detonation wave front of gases was studied by method of shock tube) (See its abstract under Detonation Wave Structure) 38a) R.E. Duff E. Houston, 2nd ONRSympDeton (1955), p 225 (See under Detonation Wave Structure Measurements in Condensed Explosives) 39) S. Minshall, JApplPhys 26, 463- 69 (1955) (Properties of elastic and plastic waves determined by pin contactors and crystals) 40) C.G. Dunkle, "Introduction to Theory of Detonation of Explosives, Syllabus of 21 Nov 1955 and Lecture Delivered at Picatinny Arsenal on 13 Dec, 1955 (Structure of the deton wave)... 

The texture observed on the scale of the micron is the result of an underlying structure which appeared to be all the more worthy of study since the transformations up to the end of the zone of plasticity largely determine the physicochemical properties of the cokes. Thus the important problem of the texture of cokes and industrial carbons is stated. 

Plasticity property of certain coals when heated in the absence of air. For a relative and a semiquantitative method for determining the relative plastic behavior of coal, refer to ASTM D-2639 and ASTM D-1812, respectively. 

The overall nature and properties of a plastic are determined by its chemical structure, macromolecule mass, and the additives compounded into it. 

Our study is outlined in five parts, (a) Two polystyrene plastics were reinforced at different fiber contents alternately with polyester, asbestos, and glass fibers, (b) The mechanical/physical properties of the resultant monofiber-reinforced plastics were determined and compared, (c) Combinations of fibers were then used to fabricate multifiber-rein-forced structures to exploit simultaneously the particular advantages of the different reinforcements, (d) The effect of each fabrication stage on the molecular weight and molecular weight distribution of the matrix plastics was established and (e) a linear mathematical model was formulated to predict the properties of multifiber structures and forecasted values compared with corresponding values experimentally obtained from (c) above. 

No functional relationship between the flowability index according to Rashig and the other indices of the viscous-plastic properties has yet been establkhed. The flowability index determined by this method serves as a preliminary assessment of the suitability of the material for processing. 

It is no coincidence that moisture and water absorption are obligatory characteristics of any new material or article based on plastic foams which, together with other properties, determine the range of application. Numerous experimental data... 

The more significant sources of information concerning the properties and applications of plastics were determined by a breakdown and analysis of two plastics literature reviews covering the years 1950 and 1951 —yiz., the literature review published annually in the technical section of Modern Plastics, and the chapter on synthetic plastic insulation in the National Research Council s annual Digest of the Literature on Dielectrics. An appended bibliography lists the major sources of information. Searching for highly specialized types of information is discussed briefly. 

The two rheological properties required—the yield stress, x , and the high-shear-limiting (or plastic) viscosity, —determine the flow behavior of a Bingham plastic. The viscosity fnnction for the... 

ASTM D 4065-01, Standard Practice for Plastics Dynamic Mechanical Properties Determination and Report of Procedures ... 

ISO 10351 (1992). Method of testing plastics. Part I. Thermal properties, determination of the combustibility of specimens using a 125 mm flame source. 

Plasticizer properties are determined by their chemical structure because they are affected by the polarity and flexibility of molecules. The polarity and flexibility of plasticizer molecules determine their... 

The word polymer is derived from the Greek poly and meros meaning many and parts respectively. Scientists also use the word macromolecule meaning large molecule instead of polymer. The long chains of atoms which comprise polymers and the bonds within and between the chains determine plastics properties. Polymers alone are not plastics. Plastics are polymers or macromolecules which have been modified with additives and shaped to convert them from liquids to solids which adopt a dimensionally stable form. 

Chapter 4 presents an overview of the chemical, optical, physical and thermal properties of plastics which are most relevant to conservation. Properties determine which plastics are suited to particular functions and also why some are no longer in use. The chapter starts with a basic description of the types of bonding and structure which determine the properties of polymers. Details of the chemical, optical, physical and thermal properties for plastics most often encountered in collections are presented in tables, one for each material, in Appendix 1. 

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