Static and dynamic mechanical properties

Using physical properties relating to performance parameters leads to the development of algorithms for predicting performance for laboratory screening of potential improvements. Many of these algorithms have been estabUshed. The two main categories of measurement criteria are quasi static and dynamic mechanical properties. 

Interest in the use of syntactic foam as a shock attenuator led to studies of its static and dynamic mechanical properties. Particularly important is the influence of loading rate on stiffness and crushing strength, since oversensitivity of either of these parameters can complicate the prediction of the effectiveness of a foam system as an energy absorber. 

We have investigated the static and dynamic mechanical properties of networks of different chemical and topological structures ( 19,20). In a previous paper, we reported results obtained on networks with crosslink functionality four (21). In the present study, we investigated the effect of the structure of junctions on the mechanical behaviour of PDMS. Rather uncommon networks with comb-like crosslinks were employed, intending that these would be most challenging to theoretical predictions. 

The static and dynamic mechanical properties, creep recovery behaviour, thermal expansion and thermal conductivity of low-density foams made of blends of LDPE and EVA were studied as a function of the EVA content of the blends. These properties were compared with those of a foam made from a blend of EVA and ethylene-propylene rubber. A knowledge of the way in which the EVA content affects the behaviour of these blend foam materials is fundamental to obtaining a wide range of polyolefin foams, with similar density, suitable for different applications. 9 refs. 

In the active probe approach, SFM acquires both static and dynamic mechanical properties (Sect. 2.2.2). The former includes the shear and Young s modulus (G,E) as well as the surface indentation and contact area (S,a). Dynamic meas-... 

However, the difference in olefin concentration of EPDM and natural rubber results in a cure-rate misbatch leading to an incompatible blend. This has been recognized to cause both inferior static and dynamic mechanical properties such as poor tensile strength, fatigue resistance, and high hysteresis in the rubber blend (17). 

I. Ulkem "Static and Dynamic Mechanical Properties of (Bauxide) and (Carbon Black) Filled SBR Vulcanizates Effects of Filler Surface Modification on Properties Ph.D. Thesis, Middle East Technical University, Dept, of Chem., Ankara, (July 1990), Paper is in Preparation. 

Filled Composites. Use of afm in characterizing filled composite materials has ranged from determination of composite morphology as a function of fabrication method to examination of the morphological effects of the reinforcing agent upon the matrix resin, and static and dynamic mechanical properties of the composites. 

Jayanarayanan K, Thomas S and Joseph K (2008) Morphology, static and dynamic mechanical properties of in situ microfibrillar composites based on polypropylene/poly(ethylene terephthalate) blends. Compos Part A 39 164-175. 

Jayanarayanan K, Thomas S and Joseph K (2008) Static and dynamic mechanical properties of... 

Microfibrils Reinforced Composites Based on PP and PET Effect of Draw Ratio on Morphology, Static and Dynamic Mechanical Properties, Crystallization and Rheology... 

Scheme 15.4, Figures 15.4,15.6 and 15.8-15.10 are adapted/reprinted from Composites Part A, Applied Science and Manufacturing, Vol. 39, 2008, Authors Jayanarayanan K, Thomas S and Joseph K, Title Morphology, static and dynamic mechanical properties of in situ microfibrillar composites based on polypropyl-ene/poly (ethylene terephthalate) blends, pp. 164-175, Copyright (2008), with permission from Elsevier Ltd. 

Plastics can be affected in different ways by temperature. It can influence short- and long-time static and dynamic mechanical properties, aesthetics, dimensions, electronic properties, and other characteristics. Fig. 6.3 provides a guide relating time at temperature vs. 50% retention mechanical and physical properties. Testing temperature was at the exposure temperature of test specimens. 

The static- and dynamic-mechanical properties and parameters grouped in Table 1 refer to crystalline PO below the melting temperature, but some of them characterize the corresponding PO in the molten (viscoelastic) state, too. 

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