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Chapter
Falling Weight Impact Tests
Several variants of the falling weight impact test have been used to assess the impact behaviour of polymers and polymer products. Table 1 gives a list of current test methods included in the ASTM Standards fo...
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Chapter
Falling Weight Impact Testing Principles
The falling weight impact test (or dart drop test) is one of the methods used to assess the impact properties of polymers (see Fast Fracture in Polymers and Impact and Rapid Crack Propagation Measurement Techniqu...
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Chapter
Falling Weight Impact Testing Equipment
Fig. 1 shows the elements of an instrumented falling weight impact (IFWIM) testing system (see Falling Weight Impact Testing Principles). The equipment usually includes
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Chapter
The Use of Modern Methods in the Development of Calcium Carbonate Inhibitors for Cooling Water Systems
Cooling water systems represent the single largest area of industrial water use. Most of these systems operate by evaporative cooling, allowing the system water to become supersaturated with respect to dissolv...
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Article
Fracture behaviour of uPVC thin tubes at high loading rates
Impact tests and fracture toughness tests were carried out using thin cylindrical specimens of unplasticized poly (vinyl chloride). The specimens, both pre-notched and unnotched, were internally pressurized to...
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Article
Fracture behaviour of UPVC thin tubes at high loading rates
The use of fracture mechanics concepts in describing the failure behaviour of unplasticized poly(vinyl chloride) at high loading rates is studied. An impact test is employed which uses a gas pulse generated by...
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Article
Flexed plate impact testing of poly(ether sulphone) Part III Flow geometry effects
Tests on various sample shapes moulded from poly(ether sulphone) show that the response to an excess energy impact may be brittle failure, ductile failure or mixed mode failure, depending on the geometrical fe...
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Article
The falling weight impact test applied to some glass-fibre reinforced nylons
Measurements on five glass-fibre reinforced compounds have shown that at fibre weight fractions of 0.3 and 0.5 increased mean fibre length confers greater resistance to impact as measured by a conventional fle...
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Article
Flexed plate impact testing of poly(ether sulphone)
Injection-moulded discs of poly(ether sulphone) impacted at 5 m sec−1 in a standard flexed-plate configuration fail by a ductile penetration process and the peak force is proportional to the specimen thickness. T...
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Article
Flexed plate impact testing of poly(ether sulphone)
Injection-moulded discs of poly(ether sulphone) impacted at 5 m sec−1 in a standard flexed-plate configuration fail by a ductile penetration process and the peak force is proportional to the specimen thickness. T...
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Article
The falling weight impact test applied to some glass-fibre reinforced nylons
Tests and experiments carried out in three laboratories on five glass-fibre reinforced nylon compounds have shown that relatively small differences in the electrical filtering lead to important differences in ...
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Article
Structural deformation in polyethylene during cold-drawing
A permanganic etching technique is used to study the morphology of blow-moulded polyethylene before and after cold-drawing. The morphological changes that occur in the necked region during drawing are also exa...
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Article
Deformation of poly (dienes) below T g
Cross-linked poly(dienes) (polychloroprene, polyisoprene and polybutadiene) are shown to exhibit crazing when subjected to low strain-rate tensile tests at low temperatures. Conditions for crazing to occur in ...
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Article
ESR study of degraded bovine bone
A comparison is made between the electron spin resonance (ESR) spectra obtained from bovine bone samples after (i) mechanical degradation, (ii) γ-irradiation, and (iii) mechanical degradation followed by γ-irr...
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Article
Application of fracture mechanics to plastics deformed at high strain-rates
The effects of wall thickness and tube length on the fracture strength of thin walled cylindrical specimens of poly(methylmethacrylate) containing artificial flaws is examined. Data obtained are compared with ...
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Article
High strain rate testing of plastics
A technique for subjecting thin walled tubular specimens to a controlled, sudden internal pressurization is described. The technique may be used as an impact test or to obtain stress-strain data over a wide ra...
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Article
Application of fracture mechanics to plastics deformed at high strain-rates
Thin walled cylindrical specimens of poly(methylmethacrylate) containing artificial flaws of different length and machined along a generator of the cylinder, are subjected to internal pressure pulses (shock pu...
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Article
Band-deformation in PVC tubes: a material or processing property?
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Chapter
Deformation of Cross-Linked Polymers Below Tg
Tensile tests were carried out on oriented elastomers in the glassy condition, and the deformation process was monitored by ESR. Both the nature and quantity of radicals formed are discussed. It is found that ...
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Article
A combined cryostat/oven and specimen transfer device for tensile testing in the range 83 to 473° K
Design details and performance of a combined cryostat and oven for an Instron TT-CM universal testing machine are described. The cryostat is suitable for tensile testing in the range 83 to 473° K and has a tes...
