Mechanical fasteners nails

Combining is a process of joining two or more materials together. Using mechanical fasteners such as nails, staples, screws, bolts, and rivets is a common method of combining materials. One advantage of mechanical fasteners is that they can join together different types of materials. Mechanical fasteners also allow for easy assembly and disassembly of a prototype. 

Mechanical Typical mechanical fasteners are Adaptable to many Some have limited pull- Nails and staples are applied by... 

By definition, a structural bond involves the formation of a load-bearing joint between high-strength materials, typically metal, wood, ceramic, and certain plastics. The first step in the selection of a joining method should be a comparison of the relative merits of the available techniques.In addition to structural adhesives, these include a number of mechanical fastening methods, such as screws, bolts, nails, staples, and rivets, as well as metal fusion processes. Many of these techniques are usually associated with the joining of metal structures. 

Most structures require the joining of one or more similar or dissimilar materials in their fabrication. Conventional joining techniques have employed mechanical fasteners, such as screws, nails, bolts, and rivets. These joining techniques result in large stresses near the fastener, produced by nonuniform load distributions. 

By mechanical fasteners (i.e. nails), which will not be covered here but is covered in Bank et al. (2003) and Bank (2006). 

Mechanical fasteners (staples, screws, molded-in inserts, snap fits and variety of proprietary fasteners) Typical mechanical fasteners are listed at left. Devices are made of metal or plastic. Type selected will depend on how strong the end product must be, appearance fac-tors. Often used to join dissimilar plastics or plastics to nonplastics. Adaptable to many materials low to medium costs can be used for parts that must be disassembled. Some have limited pull-out strength molded-in inserts may result in stresses. Nails and staples are applied by simply hammering or stapling. Other fasteners may be inserted by drill press, ultrasonics, air or electric gun, hand tool. Special molding (i.e., molded-in-hole) may be required. 

Finally, what is often the key consideration adhesive bonding may be faster and cheaper than the weaving of cloth soldering, brazing or welding of metals or mechanical fastening of rivets, bolts, or nails. 

However, higher-molecular-weight resins tend to yield compounds with better physical properties. Many rigid PVC foam profiles are nailed or mechanically fastened to another part or surface. Properly fused resins with T-values 65 or higher are sometimes used in these applications because they are less likely to split or incur damage when nailed, cut, or mechanically fastened than the lower-molecular-weight resins typically used in foam applications. ... 

Double-sided adhesive tapes or mounting tapes have been used to replace conventional attachment methods in a range of different end-use applications. They are used on a wide variety of surfaces, for example, as an assembly aid in the automotive industry, in graphic arts for plate mounting and in home and office uses that previously required mechanical fasteners (e.g. nails and screws). The central support substrate used includes non-wovens, textile fabrics, foams and other materials and in some cases, support-free mounting tapes are also available. Foam mounting tapes are especially useful because the foam provides stress distribution for increased shear strengths. 

A very high, price and performance family of polymers called liquid crystal polymers (LCPs) exhibit extremely high mechanical and thermal properties. As their ease of processing and price improve, they may find appHcation in thin-waH, high strength parts such as nails, bolts, and fasteners where metal parts cannot be used for reasons of conductivity, electromagnetic characteristics, or corrosion. 

Despite unfavorable mechanical properties of polyethylene compared to polypropylene, PVC, ABS, and Nylon, HDPE is the most popular plastic in WPCs. Polypropylene is too tough and makes difficult to use nails and screws as fasteners at a deck installation. Polypropylene-based composites require special fastening systems. PVC is typically considered as not environmentally friendly. Other polymers are not weather stable, brittle, or expensive. 

---