Related Experiment Video
Updated: Jan 26, 2026
04:58
Mechanoluminescent Visualization of Crack Propagation for Joint Evaluation
Published on: January 6, 2023
5.7K
Sideways and stable crack propagation in a silicone elastomer
1Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843.
Summary
Researchers discovered a new "sideways" cracking phenomenon in stretchable silicone elastomers, enabling greater material stretchability. This stable cracking deviates from standard fracture paths, offering new insights into elastomer mechanics.
Area of Science:
- Materials Science
- Solid Mechanics
- Polymer Physics
Background:
- Highly stretchable silicone elastomers exhibit unique fracture behaviors.
- Understanding elastomer fracture is crucial for advanced material applications.
Purpose of the Study:
- To investigate a peculiar "sideways" cracking phenomenon in silicone elastomers.
- To elucidate the mechanisms behind this stable cracking and its impact on stretchability.
Main Methods:
- Finite-element simulations to model crack propagation.
- Experimental fracture testing with varying prestretch conditions.
- Microstructural characterization (chain alignment, crystallization).
Main Results:
- Observed cracks propagating perpendicular to the applied load, termed "sideways" cracking.
- Finite-element simulations confirmed the propensity for sideways cracking.
- Microstructural analysis revealed chain alignment and strain-induced crystallization influence fracture energy.
Conclusions:
- "Sideways" cracking in elastomers is linked to microstructural anisotropy and crack-tip blunting.
- This phenomenon enhances material stretchability by allowing stable crack arrest.
- Loading conditions significantly influence the occurrence and characteristics of sideways cracking.
Related Concept Videos
01:28Types of Non-structural Cracks in Concrete
488
Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
488
01:07Propagation of Waves
2.9K
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
2.9K
01:23Propagation of Action Potentials
9.2K
The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
9.2K
01:10Propagation of Uncertainty from Systematic Error
1.4K
The atomic mass of an element varies due to the relative ratio of its isotopes. A sample's relative proportion of oxygen isotopes influences its average atomic mass. For instance, if we were to measure the atomic mass of oxygen from a sample, the mass would be a weighted average of the isotopic masses of oxygen in that sample. Since a single sample is not likely to perfectly reflect the true atomic mass of oxygen for all the molecules of oxygen on Earth, the mass we obtain from this...
1.4K
00:59Propagation of Uncertainty from Random Error
1.8K
An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...
1.8K
01:30Propagation Speed of Electromagnetic Waves
4.6K
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
4.6K