Non-metallic self-lubricating bearing materials, including polymers like Thordon SXL and ThorPlas-Blue, are prized for their durability and minimal maintenance needs. However, to guarantee their long-term reliability, it is essential to understand their mechanical and thermal failure modes. This blog examines

Wear and abrasion are common failure modes where material loss occurs due to frictional forces. This is particularly critical in applications with continuous motion, such as conveyor systems or linkage connections. Over time, repeated contact with other surfaces causes the polymer bushing material to wear down, leading to increased clearances, reduced performance, and eventual failure. 

Creep occurs when a material deforms permanently under a constant load over time. Low quality plastics are particularly susceptible to creep, especially at elevated temperatures. This deformation can lead to misalignment, increased friction, and ultimately, bearing failure. 

Impact failures occur due to sudden forces or shocks, while fatigue failures result from repeated stress cycles. Both types of failures can lead to cracking, chipping, or complete material breakage. 

Thermal degradation involves the breakdown of polymer chains due to high temperatures, leading to a loss of mechanical properties and eventual failure. This can be accelerated by oxidative environments or repeated thermal cycling. 

Polymers expand and contract with temperature changes. Excessive thermal expansion can cause misalignment, increased friction, and wear, while contraction can lead to loose fittings and reduced performance. 

Thermal fatigue occurs due to repeated heating and cooling cycles, leading to the formation of cracks and eventual material failure. This is common in applications with fluctuating temperatures.