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All was not bright in the coatings industry in 1981. Although the final figures are not in at the time this report is being written, it is likely that gallonage will be down in 1981 just as it was in 1980. Of course dollar figures were up, a consequence, as everyone knows, of inflation. But the true test of performance of an industry is whether the actual units of the product increase.

Pipe Lining Service. A new company, Centrifugal Lining Ltd., has been formed to operate a process in which steel and cast‐iron pipes, new or corroded, can be cement lined in situ. The operating companies are William Press & Son Ltd. and Tate Pipe Lining Processes Ltd.

The purpose of this paper is to provide a theoretical analysis of the fracture behavior of multiple axisymmetric interface cracks between a homogeneous isotropic layer and its functionally graded material (FGM) coating under torsional loading.

In this paper, the authors employ the distributed dislocation technique to the stress analysis, an FGM coating-substrate system under torsional loading with multiple axisymmetric cracks consist of annular and penny-shaped cracks. First, with the aid of the Hankel transform, the stress fields in the homogeneous layer and its FGM coating are obtained. The problem is then reduced to a set of singular integral equations with a Cauchy-type singularity. Unknown dislocation density is achieved by numerical solution of these integral equations which are employed to calculate the SIFs.

From the numerical results, the following key points were observed: first, for two types of the axisymmetric interface cracks, the SIFs decrease with growing in the values of the non-homogeneity. Second, the SIFs increase with increases in interface crack length. Third, the magnitude of the SIFs decreases with increases in the FGM coating thickness. Fourth, the interaction between cracks is an important factor affecting the SIFs of crack tips.

New analytical dislocation solution in an FGM coating-substrate system is developed.

Various companies, including Dow Chemical, Dow Corning, PMC Specialities, Vanderbilt Corporation and Kusumoto Chemicals, with a long history of service to the paint, printing ink and allied industries, are represented. Products featured include antimicrobials, cellulose ethers, resins, propylene glycol ethers, silicones and a variety of speciality additives designed to meet the demand within surface coatings for improved properties.

Visits to test sites and laboratories; fundamental research on corrosion and protective coatings for steel discussed

Formability is an important property of automotive pre-coated metals (PCMs). The purpose of this study is to investigate the effect of long alkyl chains of polycarbonatediol to control the formability of polyester coatings.

Polyester resins with long alkyl chains were synthesized using different contents of polycarbonatediol. These resins were characterised by gel permeation chromatography (GPC), ¹H nuclear magnetic resonance (¹H NMR) and fourier transform infrared spectroscopy (FT-IR). The polyester coatings were characterised according to their viscoelastic behaviour, formability, flexibility and anti-corrosion property.

The tensile strength of PCM should be larger than 5.6 MPa of the compressive stress at a strain of 23.4 per cent to overcome the harsh condition of deep drawing. To analyse the formability, F_ε (forming coefficient based on strain) and F_U (forming coefficient based on strain energy) were calculated. When F_ε and F_U were larger than 1, the polyester coatings exhibited good formability.

Long alkyl chains of polycarbonatediol gave flexibility and good formability to the polyester coatings.

There are two conditions that lead to the good formability of PCM. One is tensile strength and the other is forming coefficients based on strain and strain energy.

Long alkyl chains of polyester were a major factor to improve flexibility and formability. Thus, to have good formability, the tensile strength of PCM should be larger than 5.6 MPa, and the forming coefficients should be larger than 1.