Buckling Of Columns
Columns are compression members whose cross-sectional dimensions are relatively small compared with their length in the direction of the compressive force. Failure of such members occurs because of instability when…
Effects Of Grain Size
When a low-carbon steel is heated above the A3 temperature line (Fig. 4.2), for example, to hot rolling and forging temperatures, the steel may grow coarse grains. For some applications,…
HEAT TREATMENT AND HARDENING OF STEELS
Heat-treated, and hardened steels are sometimes required in building operations. The most familiar heat treatment is annealing, a reheating operation in which the metal 4.62 SECTION FOUR is usually heated…
Properties Of Structural Steels
Figure 4.3 shows a typical stress-strain curve for each classification of structural steels defined in Art. 4.40.4. The diagram illustrates the higher-strength levels achieved with heat treatment and addition of…
Steel And Steel Alloys
Iron and its alloys are generally referred to as ferrous metals. Even small amounts of alloy change the properties of ferrous metals significantly. Also, the properties can be changed considerably…
Plywood And Other Fabricated Wood Boards
As ordinarily made, plywood consists of thin sheets, or veneers, of wood glued together. The grain is oriented at right angles in adjacent plies. To obtain plywood with balance—that is,…
Attractive new regenerative medicine tool uses magnets to shape and stimulate stem cells
The ultimate goal of tissue engineers who work in the regenerative medicine field is to replace damaged or diseased organs with new ones built from stem cells. To accomplish…
Tracking and mapping the health of damaged organs
Tissue engineering Medical treatments for a variety of diseases have advanced dramatically in recent decades, but sometimes they come with a cost; namely damage to surrounding tissues and…
Swim Goggles in the Spinal Canal: How Medical Devices Get Built Faster and Smarter
A few years ago, Bryan Pukenas, MD, learned something old that led him to something new. The “something old” was a technique that had fallen out of fashion many decades ago…
Using Neural Tissue Engineering to Restore Brain Function and Form Bionic Connections
Restoring Brain Connections using Micro-Tissue Engineered Neural Networks (TENNs): Micro-TENNs are miniature preformed capsule-like constructs (shown above) that consist of neurons spanned by long axon tracts. These are grown outside…
