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Space-Age Ceramics Get Their Toughest Test:

By Guest PostDecember 14, 2012Science3d imaging, abdel haboub, alastair macdowell, als beamline, bend magnet, berkeley lab, brian cox, ceramic composites, clay, ct scanning, david marshall, dilworth parkinson, Environment, failure envelope, fracture, function, gas turbine engine, hrishikesh bale, hypersonic jet, internal damage, james nasiatka, mechanical failure, mechanical properties, microcrack, microtomography, operational temperature, real time analysis, risk, robert ritchie, tesla superconducting, ultrahigh, ultraviolet light beams

Berkeley Lab Researchers Develop Real-Time CT-Scan Test Rig For Ceramic Composites at Ultrahigh Temperatures

Advanced ceramic composites can withstand the ultrahigh operational temperatures projected for hypersonic jet and next generation gas turbine engines, but real-time analysis of the mechanical properties of these space-age materials at ultrahigh temperatures has been a challenge – until now. Researchers with the U.S. Department of Energy (DOE)’s Lawrence Berkeley National Laboratory (Berkeley Lab) have developed the first testing facility that enables CT-scanning of ceramic composites under controlled loads at ultrahigh temperatures and in real-time.

Working at Berkeley Lab’s Advanced Light Source (ALS), a premier source of X-ray and ultraviolet light beams, the scientists created a mechanical testing rig for performing X-ray computed microtomography that reveals the growth of microcrack damage under loads at temperatures up to 1,750 degrees Celsius. This allows engineers to compute a ceramic composite material’s risk of structural or mechanical failure under extreme operating conditions, which in turn should enable the material’s performance and safety to be improved. (more…)

The Brittleness of Aging Bones – More than a Loss of Bone Mass

By Guest PostSeptember 3, 2011Scienceadvanced light source, age related structural changes in human cortical bone, als, berkeley lab, biological aging, björn busse, bone strength and fracture toughness, bones, brittle, calcium, collagen molecules, concentric rings of lamellae plates, department of energy, doe, elizabeth zimmermann, eric schaible, fracturing, ha, holly barth, hrishikesh bale, human cortical or compact bone, hydroxyapatite, joel ager, lawrence berkeley national laboratory, loss of mass, macroscopic fracture testing, molecular level, nanocrystals, nanoscale, older bones fracturing, peter reichert, robert ritchie, simon tang, tamara alliston, uc, university of california, young human bone

*Berkeley Lab Researchers Show How Loss of Bone Quality Also a Major Factor*

It is a well-established fact that as we grow older our bones become more brittle and prone to fracturing. It is also well established that loss of mass is a major reason for older bones fracturing more readily than younger bones, hence medical treatments have focused on slowing down this loss. However, new research from scientists at the U.S. Department of Energy (DOE)’s Lawrence Berkeley National Laboratory (Berkeley Lab) shows that at microscopic dimensions, the age-related loss of bone quality can be every bit as important as the loss of quantity in the susceptibility of bone to fracturing. (more…)

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Space-Age Ceramics Get Their Toughest Test:

The Brittleness of Aging Bones – More than a Loss of Bone Mass