Additive Manufactured Strain Sensor Using Stereolithography Method with Photopolymer Material

Area of Science:

• Materials Science
• Mechanical Engineering
• Additive Manufacturing

Background:

• Additive manufacturing (AM) technologies, including 3D printing, are evolving beyond rapid prototyping to large-scale production.
• Strain sensors are crucial for monitoring deformation in various applications, particularly in soft materials where traditional sensors are unsuitable.

Purpose of the Study:

• To fabricate and experimentally evaluate a novel 3D-printed strain sensor for direct use in soft applications.
• To investigate the material properties and performance characteristics of the 3D-printed strain sensor.

Main Methods:

• Fabrication of a 2 mm thick strain sensor using a Stereolithography (SLA) 3D printer.
• Utilized photopolymer-based flexible and conductive ultraviolet (UV) resin materials for sensor construction.
• Conducted experimental studies under loading/unloading conditions and tensile tests on material specimens.

Main Results:

• A close linear relationship was observed between the strain applied to the sensor and its measured resistance.
• Tensile strength data provides insights into the sensor's mechanical behavior and placement suitability.
• The flexible nature of the 3D-printed sensor confirms its potential for diverse soft applications.

Conclusions:

• The developed 3D-printed strain sensor is a viable option for soft applications due to its linear response and flexible structure.
• Additive manufacturing, specifically SLA, enables the creation of functional sensors with tailored material properties.
• Further characterization of tensile strength is essential for optimizing sensor integration in specific soft systems.