Joint members

C = joint clearance D = diameter of lap area F = shear strength of brazed filler metal J = joint integrity factor of 0.8 L = length of lap area = IW(D-W) T ] / JFD T = tensile strength of weakest member th = thickness of thinner joint member W = wall thickness of weakest member... 

Paragraph IP-5.8 shall apply in its entirety, in addition to the following requirements Expanded and special joints (as defined in para. IP-5.8) shall be installed and assembled in accordance with the manufacturer s instructions. The manufacturer s instructions shall be permitted to be modified by the engineering design. Joint members shall be adequately engaged. 

Wheaton Clear-Seal joints have the unique attribute that they do not need any stopcock grease. However, they require very special handling and storage, because any scratch can destroy their sealing abilities. Additionally, when joint members are joined, special care must be taken to ensure that no particulate matter lodges between the pieces. Such matter can prevent a proper seal, scratch the sides of the members, and/or cause the members to jam or stick. Because no stopcock grease is used with Clear-Seal joints, it is more difficult to separate stuck members. 

A sealant, such as Apiezon W, is a good example of a material that was designed for an extremely limited application. Apiezon W is a hard black wax that needs to be heated to 80°-90°C before it is soft enough to apply to the members you wish to join. At room temperatures it is hard and has no lubrication abilities whatsoever and is therefore not usable for a stopcock. It has a relatively high vapor pressure (10 3 torr), so it cannot be used for most vacuum work. However, at temperatures of about 100° to 150°C, it becomes very thin like hot honey and can easily be applied to joint members. Therefore, if you have a standard taper joint that will not be in a high-heat or ultrahigh-vacuum environment, there is no need to separate often, and you don t want it to accidentally separate, Apiezon W is the type of sealant you need. 

Coating of one joint member with an adhesive strip of controlled thickness and width... 

Clamping the joint members into position and spot welding directly through the adhesive layer... 

In adhesives formulated in the F- and M-Series (Table I), approximately 5 to 10 minutes at ambient temperature was required to reach an end-joint tensile strength of 500 psi, a value deemed adequate to permit gentle handling of the end-jointed members. Between 15 and 20 minutes at ambient temperature was required to reach a tensile strength of 1,500 psi (11). 

Joining technique—A classification used within each of the joint categories that characterizes the joint by stating either the method of the load transfer between the joint members or the technique for producing the joint. 

P(2) In addition, the assumed distribution of internal forces shall be realistic with regard to the relative stiffnesses of the joint members and/or the adhesive/fasteners. 

P(l) The loads for the bonded joint analysis shall be obtained from the global analysis of the structure. The bonded Joint design ensures that the bondline is capable of transferring the applied loads between the Joint members and that the joints members (adherends) are capable of withstanding the Joint-induced internal loadings. The basic strength of the components to be Joined under the applied external loads shall be evaluated as a part of the component design process (Chapter 4). 

The possible applications for moulded joints range from highly loaded structures using SMC or RTM joint members to lightly loaded ones utilizing injection moulded joint members. 

P(6) The load transfer to injection moulded thermoplastic joint members shall be based on mechanical interlocking and not on adhesion, unless additional surface treatments specific to thermoplastic materials are applied. 

When an adhesively bonded or laminated joint has failed due to adhesive/resin failure and none of the joint members is damaged, the joint may be reassembled using adhesive bonding with proper structural adhesive. Surfaces shall be treated according to 5.3.1.5 prior to bonding. 

Injection moulded reinforced thermoplastic joints should only be used in lightly loaded non-structural connections because they typically give a weak adhesion to almost all materials. Therefore, the load transfer from the joint component to the injection moulded reinforced thermoplastic joint member should be based on mechanical interlocking and not on the adhesion. 

Gaps remaining in completed adhesive joints should not be permitted. Defective adhesive joints/members containing gaps should be replaced or given remedial treatment (see section 5.3). 

These two methods yield the same normal joint spacing values if the joint members are perfectly parallel. However, natural joints are rarely perfectly parallel, resulting in different normal joint spacings obtained by these two methods. 

In this paper, another means for determining the normal joint spacing from apparent joint spacing measurement is proposed. This method is based on the geometrical relationship between the scanline orientation and the averaged orientation of two adjacent joint members of the same set. This approach closely resembles the practice of direct field measurement of joint normal spacing. 

Standard roller chains are defined as pitch proportional, which makes them different from othCT types of chains with rollers. The ASME standards nominal dimensions for these chains are approximately proportional to the chain pitch. The pitch of a roller chain is the distance betweai the centers of adjacent joint members. The three most important roller chain dimensions are pitch, roller diameter, and inside chain width, as indicated in Figure 2-5. These dimensions detramine the fit between the chain and the sprockets. 

Because of the attrition which occius if the joint members slip past each other during failure the appearance of a joint which has broken after yielding of the adhesive may not be very different from one that... 

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