Related Experiment Video
Updated: Jul 13, 2026
06:59
Environmental Dynamic Mechanical Analysis to Predict the Softening Behavior of Neural Implants
Published on: March 1, 2019
Physical age of soft-jammed systems.
Summary
This study reveals that soft-jammed materials age consistently. Elastic modulus changes over time follow a master curve when adjusted for density, temperature, load, and preshear time, indicating a universal aging process.
Area of Science:
- Soft matter physics
- Materials science
- Rheology
Background:
- Soft-jammed systems exhibit complex mechanical behavior.
- Understanding aging in the solid regime is crucial for material applications.
Purpose of the Study:
- To experimentally investigate the liquid-solid transition and aging in soft-jammed systems.
- To determine the impact of temperature, density, and load on material aging.
- To establish a universal scaling law for aging in these materials.
Main Methods:
- Experimental study of soft-jammed systems.
- Measurement of elastic modulus over time under varying conditions (temperature, density, load).
- Analysis of time-dependent mechanical properties and development of a rescaling factor.
Main Results:
- Elastic modulus versus time curves collapse onto a single master curve when appropriately rescaled.
- The rescaling factor depends on density, temperature, load, and time since preshear.
- This scaling allows differentiation between the effects of temperature and density on mechanical properties and aging.
Conclusions:
- The rescaled time represents the physical age of the soft-jammed material.
- This provides a method to characterize the effective state and structural organization of these systems.
- The findings offer a unified perspective on aging in soft-jammed materials.
Related Concept Videos
01:19The Effect of Aging on Tissues
Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
01:22Mechanical Systems
Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically described...
01:21Fatigue
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
01:11Work Done on a System by External Force
The work done by an external force on a particle changes its kinetic energy. However, internal forces must also be considered for a system of interacting particles. The potential energy formulation helps formulate the effect of internal forces. The net work done by an external force can be written in terms of the total change of mechanical energy, which includes both kinetic and potential energies.
In the presence of a non-conservative opposing force, like friction, some part of the work done...
In the presence of a non-conservative opposing force, like friction, some part of the work done...
01:28Factors Affecting Creep
In normal-weight aggregate concrete, the hardened cement paste is the primary contributor to creep, whereas the aggregates, being stiffer than the cement paste, are more resilient to stress-induced deformation. The stiffness of the aggregates is defined by their modulus of elasticity, and the more voluminous they are in the concrete, the less it will creep.
Further, the water/cement ratio is critical, as a lower ratio increases concrete strength, thus reducing creep. The strength of the...
Further, the water/cement ratio is critical, as a lower ratio increases concrete strength, thus reducing creep. The strength of the...
01:12Temperature Dependent Deformation
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...