Bridge and other infrastructure failures have been generating significant headlines in the United States. The German state Hesse has a new idea: plastic composite bridges. Europe’s’ first road bridge made of fiber-reinforced thermoset polymer opened recently, spanning a federal highway north of Frankfurt. The initial cost of the materials is higher, but there are long-term maintenance benefits. The pultruded polymer structure is also less than one-fourth the weight of a pre-stressed concrete superstructure. It’s not a giant bridge – just 89 feet long by 16 feet wide. It weighs 80 metric tons.
Some big problems had to solved, including adhesive bonding of the sections and testing. Materials being evaluated for bridge construction include glass and carbon fibers and matrix polymers of vinyl ester, epoxy and polyester. Officials say the new German bridge, located in the town of Friedberg, is expected to last 50 years without repairs. The bridge is made of FRP polymer glued to steel sections. The bridge was prefabricated and assembled on site in one day.
A composite based on a high-performance PEEK-like resin we told you about two years ago when it was still in R&D has now been licensed by the US Naval Research Laboratory (NRL) for commercial manufacturing.
Microsoft, HP, Dassault, and other industry heavyweights in 3D printing have launched a new 3DP file format, 3MF. The consortium says the spec will more fully describe a 3D model and will be interoperable with multiple applications, platforms, services, and printers.
NASA's been working on several different ongoing projects for 3D-printed rocket engine components in metals and now it's reached another first in aerospace 3D printing: a full-scale, 3D-printed rocket engine component made of copper.
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