Density, modulus of elasticity, creep, and durability of hardboard

a bibliography

Publisher: U.S. Dept. of Agriculture, Forest Service in Washington, D.C

Written in English
Published: Pages: 41 Downloads: 747
Share This


  • Hardboard -- Bibliography.

Edition Notes

StatementJohn A. Youngquist ... [et al.].
SeriesBibliographies and literature of agriculture -- 126., Bibliographies and literature of agriculture -- no. 126.
ContributionsYoungquist, John., United States. Forest Service.
The Physical Object
Pagination41 p. ;
Number of Pages41
ID Numbers
Open LibraryOL17678436M

High and Low Modulus of Elasticity. In defining the upper and lower boundaries of the modulus, we determine how well a substance can resist deformation. This is an essential feature for foam-based products, a factor that references how efficiently a dense foam responds to .   Modulus of Elasticity in figure The slope of the initial straight portion is the initial tangent modulus The slope of the joining the point to the origin is the secant modulus The value of secant modulus depends on the stress and the rate of application of the load The dynamic modulus is determined by subjecting a beam specimen to. The modulus of elasticity of concrete is a function of the modulus of elasticity of the aggregates and the cement matrix and their relative proportions. The modulus of elasticity of concrete is relatively constant at low stress levels but starts decreasing at higher stress levels as matrix cracking develops. The elastic modulus of the hardened. Units of Modulus of Elasticity/Young’s modulus are: Nm-2 or Pa. The practical units used in plastics are megapascals (MPa or N/mm 2) or gigapascals (GPa or kN/mm 2).In the United States customary units, it is often expressed as pounds (force) per square inch (psi).

This article discusses the properties and applications of stainless steel grade (UNS S).   The same model explains satisfactorily the isolated effect of the elastic modulus of the aggregate on the creep and creep recovery of concrete. In order to provide a critical test of this effect, experiments were carried out on concretes made with artificial aggregates having a large range of elastic .   and elastic contraction (E) occurs, corresponding approximately to the elastic extension at the start of the test. Thus, it is apparent that metals creeping under stress at high temperature can and do show both plastic and elastic properties. The amount of permanent deformation is represented by (F). Figure 4 Schematic Creep Curve (1). What is the value of modulus of elasticity of concrete Answers - В В R. Dodge Woodson, in Concrete Structures, Publisher Summary. Modulus of elasticity is a measure of stiffness, with higher-modulus materials exhibiting less deformation under load compared to low-modulus materials. When making a repair, the modulus of elasticity should be similar to that of the concrete.

Young’s Modulus of Elasticity measures the force required to stretch rope fibers. High values indicate large forces are required, i.e., high modulus means little elasticity. Although elasticity is highly desirable in some applications, e.g., an anchor rode or a dynamic climbing rope, elsewhere it is a . Density of stainless steel (g/cm3) Melting point of stainless steel ℃ Specific heat capacity, J/(KgK) at 20 ℃ Electrical resistivity, μΩm: (20 ℃) Magnetic permeability: (Approximate) Modulus of elasticity (Elastic modulus), GPa: (28×10 6 psi) Thermal diffusivity, mm2/s: ( ℃). Elasticity Modulus, Shrinkage, and Creep on High-strength Concrete as Adopted by AASHTO. This paper covers the experimental and theoretical components of National Cooperative Highway Research Program (NCHRP) research project Number , which is discussed in NCHRP Report Bulk Modulus for Liquids. The bulk modulus for a liquid is defined as the ratio of a change in pressure to the relative change in volume. Common uses for the bulk modulus include: Calculation of the speed of sound for liquids, which useful for applications where pressure waves are important like dynamics modelling and surge analysis.

Density, modulus of elasticity, creep, and durability of hardboard Download PDF EPUB FB2

Bao, Zhao-Zhen. Density, Modulus of Elasticity, Creep and Durability of Hardboard: A Bibliography. Bibliographies and Literature of Agriculture Madison, WI: U.S.

Department of Agriculture, Forest Service, Forest Products Laboratory. 41 p. The Forest Products Laboratory is maintained in cooperation with the University of Size: KB. Density, Modulus of Elasticity, Creep, and Durability of Hardboard: A Bibliography U.S.

Department of Agriculture, Forest Service, - Hardboard - 41 pages 0 Reviews. Shipping list no.: P. Density, modulus of elasticity, creep, and durability of hardboard: a bibliographyPages: American Hardboard manufacturers main-tain and manage more than one million acres of forest land in soft and hardwoods.

How hardboard is used. American hardboard manufacturers pro-duce more than 7-billion square feet of hardboard every year, for a creep different products: from prefinished wall panelings to furniture components. topics: particle boards, chemicophysical properties, panneau de particules, propriete physicochimique, tableros de particulas, propiedades fisicoquimicas.

A/3: Density, Modulus of Elasticity, Creep, and Durability of Hardboard 4/12/ A 19 National School Lunch Program 12/1/ A 47 USDA's Acceptance Service for Meat and Meat Products 6/1/ The Story of Hardbord A Technical Discussion. Over the last few years modulus of elasticity received countless calls from customers wanting to understand the conflicting information they’ve read or been told on whether hardboard (most often referred to as Masonite) is a good substrate for painting.

Elastic Properties 12–2 Modulus of Elasticity 12–2 Shear Modulus 12–3 Strength Properties 12–3 Panel Products 12–3 Plywood 12–3 Oriented Strandboard (OSB) 12–4 Particleboard 12–4 Hardboard 12–4 Medium-Density Fiberboard 12–5 Timber Elements/Structural Composite Lumber 12–5 Glued-Laminated Timber 12–5 Structural Composite.

density, ductility, hardness, etc. Resins that are produced without comonomer are called homopolymers. Regardless of process type, the chemical process is the same. Under reaction conditions, the double bond between the carbon atoms is broken, allowing a bond to form with another carbon atom as shown in Figure 1.

Thus, a single modulus of elasticity of PE is. 1The surface density of bondsN S can be computed from the material’s densityρ,atomicweightW a and Avogadro’s 6Elasticity is a form of materials response that refers to immediate and time-independent deformation upon STIFFNESS IN TENSION - YOUNG’S MODULUS 11 isaminorextensionofEqn modulus of elasticity for various strengths of creep.

Modulus of elasticity of concrete increases approximately with the square root of the strength. The IS of gives the Modulus of elasticity as E C = fck where E C is the short term static modulus of elasticity in N/mm2. Genre/Form: Bibliography: Additional Physical Format: Online version: Density, modulus of elasticity, creep, and durability of hardboard.

Washington, D.C.: U.S. Dept. Figure 1 - Ashby plot presenting the modulus of elasticity vs. the density for various wood species and thermoplastic products Amb iente Construído, Porto Alegr e, v.

17, n. 2, p. The following table is Structural Lumber Wood Engineering Properties. Modulus of Elasticity of Wood, Wood Engineering Design Data. Modulus of elasticity also referred to as Tensile Modulus or Young's Modulus. Elastic ratios for various wood species at approximately 12% moisture content - see bottom of webpage.

Related Lumber Wood Engineering Data. 1. Modulus of Elasticity and Strength11/20/99 Author: Tomas U. Ganiron Jr 1 2. The Modulus of the elasticity is the ratio of stress to corresponding strain below the proportional limit.

• For granites and limestone the modulus of elasticity in. Prediction of the elastic properties of cementitious materials has been the aim of many researchers. This study developed a new multiscale and multiphase model based on the Mori-Tanaka method for predicting effective elastic properties of hardened cement paste, such as modulus of elasticity.

Modulus of Elasticity also know as Young's Modulus is the mathematical description of an object or substance's tendency to be deformed elastically (i.e., non-permanently) when a force is applied to it. The elastic modulus of an object is defined as the slope of its stress-strain curve in the elastic.

Wood Density - ρ - (kg/m 3) Fibre Stress at Elastic Limit - σ y - (MPa) Modulus of Elasticity - E - (GPa) Compressive Strength parallel to Grain - σ - (MPa) Shear Strength parallel to grain - τ - (MPa) Alder, red: Ash - Black, Blue, Green, Oregon, White.

Since the modulus of elasticity values are determined from bending, the tabulated values given above includes an effect of shear deflection.

E L values from bending can be increased by 10% to remove this effect approximately. Elastic ratios for various woods at approximately 12% moisture content: Kind of Wood: E T /E L: E R /E L. is similar tobut uses titanium as a stabilizer.

They differ in that they are resistant to intergranular corrosion after heating to temperatures in the carbide precipitation range. Static and Dynamic Moduli of Elasticity in Hardboard Static and Dynamic Moduli of Elasticity in Hardboard Moslemi, Ali A.; Bair, James G.

Ali A. Moslem. and James G. Bair Holzforschung by Ali A. Moslem. and James G. Bair Southern Illinois University -- E. Du Pont de Nemours & Co. The modulus of elasticity in hardboard is an important strength parameter whose. Modulus of Elasticity and Modulus of Rupture: For determination of modulus of elasticity and modulus of rupture, eight rectangular specimens shall be cut.

The length of the specimen shall be 20 t±50 mm (where t is the nominal thickness of the test panel) subject to a maximum length of mm and a minimum length of mm.

ELASTIC PROPERTIES Modulus of Elasticity Approximations from ACI Building Code The modulus of elasticity of concrete is a function of the modulus of each constituent (cementitious matrix, lightweight and normal-density aggregates) and their relative proportions in the mixture.

The elastic modulus of normalweight. Equation (1) is the calculation for the modulus of elasticity of concrete E c according to the pre AASHTO LRFD specifications Eq.

(): E c = 33,w c f' (1) where c f' = compressive strength of concrete w c = density of concrete related to modulus of elasticity, shrinkage, and creep of concrete.

The experimental program was. The ε i can be easily calculated as the σ c /E c ratio, in which σ c is the compressive stress applied to the specimens and E c is the compression modulus of elasticity. The creep coefficient φ (t) at time, t, may be obtained according to Eq., where σ is the applied stress and E c,28 is the modulus of elasticity of concrete at 28 days.

An investigation was carried out to study strength, modulus of elasticity and shrinkage of concrete containing palm oil fuel ash (POFA). Following DoE mix design, OPC concrete was made to have a.

E = Young's Modulus of Elasticity (Pa, N/m 2, lb/in 2, psi) named after the 18th-century English physician and physicist Thomas Young; Elasticity. Elasticity is a property of an object or material indicating how it will restore it to its original shape after distortion.

A spring is an example of an elastic object - when stretched, it exerts a. Variation With age The variation of modulus of elasticity with time is estimated using the expression: EC2 (18) where E (t) and f (t) are the values at an age of f days and E and f are the values at cm\ I crm / o J cm cm 28 days.

The rate of development of modulus of elasticity. The values of the modulus of elasticity as a function of temperature of concretes without fibres and with added fibres are presented in Fig. The initial values of the modulus of elasticity in the RPC were GPa and GPa, for the plain RPC and RPC_ with PP fibres respectively.

The properties which determine the quality of the hardened concrete broadly fall into the following three groups: Strength.

Durability. Dimensional stability. Fully cured, hardened concrete must be strong enough to withstand the structural and service loads which will be applied to it and must be durable enough to withstand the environmental exposure for which it is designed.

Typical Soil Elastic Modulus (Young's Modulus) Values. More Properties. Notation and Units. Metric and Imperial Units. The above values have been provided with both imperial and metric units.

As with all calculations care must be taken to keep consistent units throughout.MODULUS OF ELASTICITY OF CONCRETE The modulus of elasticity of concrete E c adopted in modified form by the ACI Code is given by With normal-weight, normal-density concrete these two relations can be simplified to where E c = modulus of elasticity of concrete, lb/in 2 (MPa); and = specified day compressive strength of concrete, lb/in 2 (MPa).Relation Between Effects of Porosity on Strength and on Young's Modulus of Elasticity of Polycrystalline Materials D.

P. H. HASSELMAN The initial concepts for this note were obtained while tlie writer was physicist, Applied Research Branch, The Carborundum Company, Niagara Falls, N. Y.