Joint thickness

Depth of root surface concavity [Note (3)] Total joint thickness, including weld reinforcement, >TW... 

K Depth of root surface concavity Total joint thickness, incl. weld reinf, > ... 

In bonded joints, a damage area, the size of which is often linked to the joint thickness and the adhesive properties, may appear ahead of the crack tip before fracture [1,2, 3]. In the case of wooden adhesive joints, the overall behaviour of the structure may be affected by the presence... 

Because of the high scattering of experimental results and the great difficulty in reaching the fully cohesive failure of wooden adhesive Joints, a numerical analysis has been made to give a better knowledge of their mechanical behaviour for various parameters (adhesive used. Joint thickness, loading mode, etc...). For the PU resin tested previously in shear, such an analysis has been made on two steps first simulations have been made on bulk adhesive specimen to determine the mechanical behaviour of the resin and the numerical results obtained have been implanted in the FE code CASTEM 2000 [21] for the mTENF bonded specimen loaded by shear. 

The thickness t (inches) of shell for a working pressure of p (pounds per square inch) is given by t — aDp -r 2T, where T = tensile strength of plate, pounds per square inch D == shell diameter, inches a — factor of safety divided by efficiency of longitudinal-riveted joint. Thicknesses are rarely below % in. for small boilers or... 

The decision to maintain weld temperature as a postheat, together with an estimate of the time for which it must be held, must be based on a consideration of hydrogen concentration at the end of welding and some critical concentration below which cracking will not occur when the weld cools to ambient temperature. At present there is little information on these critical concentrations although it is possible to make cautious estimates. These estimates can then be used to calculate postheating times for different joint thicknesses and temperatures. Diagrams of the type shown schematically in Fig. 

Peck, J., Pang, S.S., Li, G., Jones, R., and Smith, B. (2007) Effect of UV-cured FRP joint thickness on coupled composite pipes. Composite Structures, 80, 290-297. 

Bonded assemblies are made from straight-grained spruce with a density of (425 25) kg/m at (12 1)% moisture content, free from knots. Core and cover pieces must have a moisture content of (17 0.5)% before bonding. Aluminium frames must be used to set the joint thickness to 0.5 mm and limit the bonded area to (100 0.1) X (100 0.1) mm. Pressure applied for bonding must be set to 0.8 N/mm for 24 h and bonded assemblies must be conditioned for 7 days before testing. 

Figure 15.18 shows crack speed measurements on a model joint pulled with a steady load. The crack initiated at the comer of the joint as expected. It then speeded up steadily, until it penetrated about one joint thickness along the interface. Then it travelled at constant speed in accord with Equation (15.5). From these results, the initiation force was found to be 1.39 times higher than the propagation load. This result fitted an approximate theory based on the idea that the strain energy in the shaded region of Fig. 15.18 ranained constant as the crack initiated. This gave the initiation force... 

P(i) Dimensions of joint, joint thickness, preparation, application and curing shall be as specified by the designer and in accordance with the resin manufacturer s recommendations. 

Thickness of the upper part in a single-lap joint Thickness of the lower part in a single-lap joint Thickness of the centre plate in a double-lap joint Thickness of the side plate in a double-lap joint Distance from e.g. to fastener i in x-direction Distance from e.g. to fastener i in y-direction Angle between Fj and the x-axis Relative displacement between the joined members... 

Repairs may be made by building up the section thicknesses at the defect as if making a laminated joint. Thicknesses of repair material should be at least equal to the thickness of the parent defective tube, bar, plate, etc. and in no case less than 3 mm. The procedure should be as set down in section 5.3 for bonded or laminated joints. 

It is possible to set the roller gap independently of the roller pressure by using an adjustable shim or depth stop on the roller wheels. This should be set to less than the combined thickness of the materials and can be set to zero to allow the joint thickness to be fully controlled by the applied pressure. 

Materials in rolls dl sheets CH individual parts CH surfaces are flat dl curved dl Dimensions shape of joints thickness of joints... 

Keywords Adhesive modulus Adhesys expert system Co-axial joints Compression Concealed joints Creep Elastic limit Epoxy Epoxy composite Einite element analysis Glue line thickness Goland and Reissner Hart-Smith Heat exchanger Hooke s Law Joint designs Joint thickness Lap shear strength Peel Plastic behaviour Polyurethane Pipe bonding Shear stresses Shear modulus Stress distribution Thick adherend shear test Tubular joints Volkersen equation Young s modulus... 

Table 11 lists bicomponent thiokohc sealants used in construction. The essential characteristic of these products is practical deformation, which allows estimation of the strength of these materials under a permanent tensile and compressive stress at an elasticity modulus of 0.2—0.5 MPa. Practical strain shows in joint thickness and its strain at permanent stress. 

Bond-line joint thickness As the thickness increases, UV radiation loses its ability to penetrate totally, necessitating a second cure. 

Avoid eccentricity in the joint, because it produces peel stresses. This means the thickness of the adhesive should not be excessive. Most manufacturers recommend joint thickness on the order of 0.005-0.010 in. Besides changing of the stress type, thick ad-... 

The strength capacity of the masonry depends on the strength of its components and their volume proportion in the masonry mass according to Eurocode 6, 1995. In some relevant equations found in literature (Tassios 1986), mortars joint thickness is also taken into account for the estimation of masonry strength. Furthermore, the mortar strength is primarily influenced by the type of binding system. 

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