Scientists have developed a new, highly accurate method that analyzes metabolic biomarkers to assess whether a child is on the autism spectrum. Autism spectrum disorder affects about 1.5 percent of all children, but its exact cause remains unknown, and diagnosis requires a multidisciplinary ... more
Modelling how fracturing metallic glass releases energy at the atomic level
Metallic glasses -- alloys lacking the crystalline structure normally found in metals -- are an exciting research target for tantalizing applications, including artificial joints and other medical implant devices. However, the difficulties associated with predicting how much energy these materials release when they fracture is slowing down development of metallic glass-based products.
Recently, a pair of researchers from Rensselaer Polytechnic Institute in Troy, New York, developed a new way of simulating to the atomic level how metallic glasses behave as they fracture. This new modeling technique could improve computer-aided materials design and help researchers determine the properties of metallic glasses.
"Until now, however, there has been no viable way of measuring a quality known as 'fracture energy,' one of the most important fracture properties of materials, in atomic-level simulations," said Yunfeng Shi, an author on the paper.
Fracture energy is a fundamental property of any material. It describes the total energy released -- per unit area -- of newly created fracture surfaces in a solid. "Knowing this value is important for understanding how a material will behave in extreme conditions and can better predict how any material will fail," said Binghui Deng, another author on the paper.
In principle, any alloy can be made into a metallic glass by controlling manufacturing conditions like the rate of cooling. To select the appropriate material for a particular application, researchers need to know how each alloy will perform under stress.
To understand how different alloys behave under different conditions, the researchers utilized a computational tool called molecular dynamics. This computer modeling method accounts for the force, position and velocity of every atom in a virtual system.
In addition, the calculations for the model are constantly updated with information about how the fractures spread throughout a sample. This type of heuristic computer learning can best approximate real-world conditions by accounting for random changes like fractures in a material.
Their model accounts for the complex interplay between the loss of stored elastic energy from an erupting fracture, and how much the newly created surface area of the crack compensates for that energy loss.
"Computer-aided materials design has played a significant role in manufacturing and it is destined to play far greater roles in the future," Shi said.
- metallic glasses
- Rensselaer Polytech…
- molecular dynamics
- computational methods
A new study from Rensselaer Polytechnic Institute demonstrates how graphene foam can outperform leading commercial gas sensors in detecting potentially dangerous and explosive chemicals. The discovery opens the door for a new generation of gas sensors to be used by bomb squads, law enforcem ... more
A major breakthrough in remote wave sensing by a team of Rensselaer Polytechnic Institute researchers opens the way for detecting hidden explosives, chemical, biological agents and illegal drugs from a distance of 20 meters. The new, all-optical system, using terahertz (THz) wave technolog ... more
Spiders -- what are they good for? The answer, it turns out, is more than just insect control. Spider silk is useful for a variety of biomedical applications. It exhibits mechanical properties superior to synthetic fibers for tissue engineering, and it is not toxic or harmful to living cell ... more
Many industrial buildings, including nuclear power plants and chemical plants, rely on ultrasound instruments that continually monitor the structural integrity of their systems without damaging or altering their features. One new technique draws on laser technology and candle soot to genera ... more
Monitoring and tracking biological threats or epidemics require the ability to carry out medical and laboratory tests in the field during a disaster or other austere situations. Expensive laboratory equipment is often unavailable in these settings, so inexpensive point-of-care technology is ... more
- 1analytica 2020: World’s leading trade fair to be held virtually
- 2analytica 2020: The world’s leading trade fair extends its reach with analytica virtual
- 3Portable, point-of-care COVID-19 test could bypass the lab
- 4Researchers dramatically downsize technology for fingerprinting drugs and other chemicals
- 5Attacking tumours directly on identification
- 6Towards a cell-based interceptive medicine in Europe
- 7Giant nanomachine aids the immune system
- 8A tiny instrument to measure the faintest magnetic fields
- 9Leap forward in the fight against antibiotic resistance
- 10New device can measure toxic lead within minutes
- Blood-based test accurately identifies viral infection before symptoms develop
- Method to safely study COVID-19, other contagious diseases developed
- QIAGEN fully acquires NeuMoDx Molecular
- Bruker Announces Acquisition of Canopy Biosciences, LLC
- Portable, point-of-care COVID-19 test could bypass the lab