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O możliwości szacowania współczynnika wyrównywania temperatury materiałów budowlanych na podstawie badań termograficznych

Perkowski Z.

Roczniki Inżynierii Budowlanej

2009

z. 9

67--70

A proposition of inverse problem enabling an estimation of thermal diffusivity for building materials or structural elements is presented in the work. The calculating procedure is formulated so as to use only temperature measurements made on plane external surfaces of the elements or materials samples with a use of thermographic techniques. The inverse problem may be adopted in a easy way in inspections of buildings and diagnostics of building materials – for example in a detection of damaged or moist zones.

Influence of temperature on the viscoelastic properties of drawn PE pipes

Szymiczek M., Wróbel G.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 20, nr 1-2

287-290

Purpose: Purpose of this paper is to describe the free drawing process of PE pipes in the aspect of time characteristics of the viscoelastic return. Design/methodology/approach: To determine the properties, drawing tests were conducted on chosen PE pipes, using a testing machine station. Pipe samples were preheated to a set temperature and drawn by a fixed drawing die. Changes in the pipe diameter and length of the test section were recorded for the further analysis of the pipe sample. Findings: Obtained dependencies were assumed to be the basis for formulation of conclusions as to the choice of essential process conditions for the technological sequence of PE lining deposition in the outer coating of installation pipes or reconstruction of a transmission channel. Research limitations/implications: Conducted research and their conclusions have a methodological value. They factually correspond to chosen spatial parameters of pipes and dies. Together with parallel tribological research on the conditions in the drawing die zone, they give a basis for building a model of the reverse drawing process with its all complexity. Practical implications: From a practical point of view, the obtained results allow to optimize the expansive deposition process of PE pipes in production of new and renovation of damaged elements of transmission networks - in the latter case, mainly in digless conditions. Originality/value: Original input of these works is determination of simultaneous influence of geometrical properties - the degree of inner diameter reduction of the pipe and the approach angle of the drawing die - and the temperature of the examined material on the time characteristics and participation of plastic strain in the process of viscoelastic after-deformation return.