Joint design cylindrical joints

Aspects of this subject are also dealt with in other articles, notably Acrylic adhesives. Durability - fundamentals. Joint design general. Joint design cylindrical joints. Joint design strength and fracture perspectives. In the article on Toughened acrylic adhesives, some properties are compared with those of Epoxide adhesives and anaerobic adhesives. 

Further examples are given in Anaerobic adhesives. Industrial applications of adhesives and Joint design - cylindrical joints. 

From the standpoint of long life and freedom from maintenance, dished, hemispherical and cone bottoms are the best for cylindrical tanks, and are the designs of necessity if a vessel is to be "prestressed" (see Chapter 47), or if there is a desire or necessity to eliminate expansion joints. Flat bottoms, unless provided with properly designed expansion joints, will heave upward with brick growth. In addition, adequate and frequent stiffening is required if flexing and... 

In design, it is important always to plan to accommodate this growth, based on the normal 0.16%, especially on flat surfaces like floors, with adequate expansion joints, or, where suitable, such as in cylindrical designs, by adequate restraint. Failure to do so can result in "humping" (bulging upward or outward) of flat surfaces, or rupturing the walls of inadequately designed cylindrical vessels. 

Most adhesive joint configurations are either flat or cylindrical this article is concerned with the latter type. Broader aspects of design are discussed in Joint design -general. 

Fig. 1. Diametrical clearance factor /a used in the design of cylindrical joints (see Eqn. 1 and text, standard = 0.05 mm)...

Designers should contact adhesives manufacturers who will have data for their own adhesives and can advise on joint design for flat and cylindrical joints. 

For the best possible performance, joints should be specifically designed for adhesive bonding. In a few cases only can an adhesive be used on a joint not specifically designed for adhesives - mainly cylindrical joints. Bond stresses, materials, type of adhesive, surface preparation, methods of application and production requirements can then all be considered in relation to each other at the outset. The designer should consider especially the effect of shear, tension, cleavage and peel stresses upon the joint (Fig. 1) (see Joint design strength and fracture perspectives). 

Joint design - general C WATSON Flat and cylindrical joints good and bad practice... 

O Reilly, C. (1990). Designing bonded cylindrical joints for automotive applications. In SAE International Congress and Exposition (p. paper 900776). 

Other elements of the model are the linear main spring (ks), the damper (c) and the linear translational (Kix, Kiy, Kiz, K6x, Key, Kez, Ktx, K y, K z) and torsional (Tix, Tiy, Tiz, Tex, Tey, Tez, Ttx, T y, T z) stiffness parameters of the rubber bushings that attach the suspension to the car body. These stiffness values are listed in Table 3. The model also includes a spherical joint, a slider joint and two cylindrical joints which apply the kinematic constraints of the suspension design. The end of travel snubbers were not modeled in this study. 

The ASTM D 897 tensile button test is widely used to measure the tensile strength of a butt joint made with cylindrical specimens (Fig. 20.3). The tensile strength of this bond is defined as the maximum tensile load per unit area required to break the bond (measured in pounds per squre inch). The cross-sectional bond area is usually specified to be equal to 1 in.2. The specimen is loaded by means of two grips that are designed to keep the loads axially in line. The tensile test specimen requires considerable machining to ensure parallel surfaces. 

The first 50 mm OD quartz reactor with pyrex flow straightner was wrapped with electrical heater tape and installed behind a large water cooled shield. The shield had a 10 cm diameter circular hole located in it for admission of the solar flux into the reactor. Behind the reactor, a water cooled semi-circular (cross section) cylindrical backplate prevented radiation from entering the work area through the back of the reactor. Unfortunately, the first reactor cracked at the pyrex/quartz joint when the upper portion of the reactor was accidentaly heated to a temperature in excess of its 100°C design operating temperature. 

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