Related Experiment Video
Updated: Jan 25, 2026
12:21
Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall
Published on: January 6, 2023
4.8K
Curvature-Controlled Wrinkling Surfaces for Friction
Haozhi Yuan1, Kai Wu1, Jinyu Zhang1
1State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|May 7, 2019
Summary
Wrinkled surfaces on curved materials show controllable friction. Researchers precisely tuned wrinkle patterns and size on polymer microspheres to influence friction, offering insights for advanced material design.
Area of Science:
- Materials Science
- Surface Engineering
- Tribology
Background:
- Surface topography significantly impacts material properties.
- Wrinkling is a method to create surface patterns for diverse applications.
- Friction on curved wrinkled surfaces is not well understood.
Purpose of the Study:
- Investigate friction behavior of wrinkled surfaces on curved substrates.
- Control wrinkle morphology and scale via substrate curvature and film thickness.
- Correlate friction properties with wrinkling patterns and dimensions.
Main Methods:
- Induced wrinkling by sputtering metals onto soft polymer microspheres.
- Controlled wrinkle morphology by adjusting microsphere radius and film thickness.
- Measured friction properties of various wrinkled surface patterns.
Main Results:
- Wrinkled surfaces exhibited tunable friction based on pattern and scale.
- Friction increased with roughness for dimple and labyrinth patterns.
- Dimple patterns showed lowest friction due to curvature constraints.
- Herringbone patterns displayed friction anisotropy.
Conclusions:
- Substrate curvature precisely controls wrinkle morphology and friction.
- Wrinkled surfaces offer a pathway to engineer friction on curved substrates.
- Findings guide the design of advanced surfaces for tribological applications.
Related Concept Videos
01:19Degree of Curvature and Radius of Curvature
482
The degree of curvature and the radius of curvature are fundamental concepts in determining the sharpness or smoothness of a curve. The degree of curvature is a measure of how steeply a curve bends and can be determined using the chord basis or the arc basis. In the chord basis method, the degree of curvature is defined as the central angle subtended by a chord of 30.48 meters, helping in the calculation of the radius of the curve. The arc basis method defines the degree of...
482
01:26Kinetic Friction
1.4K
Consider a truck trying to pull a stationary car. As the truck exerts a force on the car, static friction is created at the point of contact between the two surfaces. This frictional force resists the car's movement and keeps it at rest. However, when the applied force by the truck surpasses the limiting static frictional force, an interesting phenomenon occurs. The frictional force at the interface reduces to a lower value, known as the kinetic frictional force. At this point, the car...
1.4K
01:27Types of Friction Problems
971
Friction is an essential concept in physics, engineering, and everyday life. It is the force that opposes the relative motion or tendency of such motion between two surfaces in contact. One of the most common types of friction encountered in various applications is dry friction. Dry friction problems can be broadly categorized into three types, each with unique characteristics and challenges.
The first type of dry friction problem involves situations where there is no apparent impending motion....
The first type of dry friction problem involves situations where there is no apparent impending motion....
971
01:21Friction: Problem Solving
487
Friction is an essential force that influences the motion of objects in daily life. Depending on the situation, it can be either beneficial or problematic. Consider a bus with a mass of three megagrams and its center of mass at a specific point, moving along a banked road at a constant speed. The coefficient of static friction between the tires and the road is 0.5. Find the maximum angle of the banked road at which the bus would not slip or tip.
Initially, a visual representation of the...
Initially, a visual representation of the...
487
01:16Vertebral Column: Regions and Curvature
5.9K
The vertebral column or spine is a flexible column that supports the head, neck, and body and allows for their movements. It also protects the spinal cord.
Regions of the Vertebral Column
In an adult, the spine is subdivided into five regions: the cervical, the thoracic, the lumbar, the sacral, and the coccygeal region. The spine initially develops as a series of 33 vertebrae; after 20 years of age, the nine bones in the sacral region, five sacral, and four coccygeal bones fuse to form...
Regions of the Vertebral Column
In an adult, the spine is subdivided into five regions: the cervical, the thoracic, the lumbar, the sacral, and the coccygeal region. The spine initially develops as a series of 33 vertebrae; after 20 years of age, the nine bones in the sacral region, five sacral, and four coccygeal bones fuse to form...
5.9K
01:21Characteristics of Dry Friction
968
Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
968