Sökning: "strength grading"
Visar resultat 6 - 10 av 29 avhandlingar innehållade orden strength grading.
6. Studies of the fibre direction and local bending stiffness of Norway spruce timber : for application on machine strength grading
Sammanfattning : Machine strength grading is a production process in the sawmill industry used to grade sawn timber boards into different strength classes with specific characteristic values of the bending strength, modulus of elasticity (MOE) and density. These properties are called grade determining properties. LÄS MER
7. Strength grading of structural timber and EWP laminations of Norway spruce : Development potentials and industrial applications
Sammanfattning : Machine strength grading of structural timber is a sawmill process by which considerable value is added to sawn products. The principle of such grading is that the strength of a timber member is predicted on the basis of a so called indicating property (IP) which, in general, represents an averaged value of the modulus of elasticity (MOE) measured over a board length of about one meter or more. LÄS MER
8. Modelling and strength grading of structural timber and glulam lamellae on the basis of optical scanning and dynamic excitation
Sammanfattning : Machine strength grading of sawn timber is a sawmill process in which density, modulus of elasticity (MOE) and bending or tensile strength are predicted such that the timber can be assigned to strength classes. The predictions of these properties are performed using one or several so-called indicating properties (IPs), which represent a board property, or combination of board properties, measured non-destructively. LÄS MER
9. Thermally Modified Timber : Novel Aspects of Bending Behaviour Towards Grading and Structural Applications
Sammanfattning : Thermally modified timber (TMT) has gained market share in Europe as an environmentally friendly and durable building material. Unfortunately, TMT products are currently prohibited for use in structural applications as there is insufficient data to estimate the loss in strength due to thermal modification. LÄS MER
10. Criterion-referenced measurement for educational evaluation and selection
Sammanfattning : In recent years, Sweden has adopted a criterion-referenced grading system, where the grade outcome is used for several purposes, but foremost for educational evaluation on student- and school levels as well as for selection to higher education. This thesis investigates the consequences of using criterion-referenced measurement for both educational evaluation and selection purposes. LÄS MER