What Is Degradation?

Degradation is the progressive deterioration of a material, component, or system from its original state, leading to reduced performance, increased failure probability, or eventual functional loss. In electrical and systems engineering, degradation refers to changes in physical, chemical, or electrical properties that cause a device or system to drift outside acceptable operating specifications over time. The field draws from materials science, reliability engineering, electrochemistry, and thermodynamics, and its study underpins product design for durability, qualification testing, and lifecycle management.

Degradation is distinct from sudden failure: it describes a gradual process that may be monitored, modeled, and managed through design choices and maintenance strategies. Understanding the mechanisms by which degradation progresses, and the rate at which it does so under different operating conditions, is central to predicting remaining useful life and ensuring that systems remain safe and functional over their intended service period.

Physics of Failure and Failure Analysis

Physics-of-failure (PoF) is an approach to reliability engineering that identifies the underlying physical, chemical, and mechanical mechanisms responsible for degradation and failure. Rather than relying solely on empirical failure rate statistics, PoF models the degradation process from first principles: thermal cycling drives fatigue cracking at solder joints, electromigration causes voids in metal interconnects under high current density, and dielectric breakdown progresses through insulator materials under sustained electric field stress.

The ASME Journal of Electronic Packaging review of failure-mechanisms-driven reliability models for power electronics surveys how physics-of-failure approaches have been applied to semiconductor devices, with attention to thermal, mechanical, and electrical degradation modes. Accelerated life testing subjects components to elevated temperatures, voltages, or cyclic stresses to precipitate failure in compressed timeframes, and the resulting data are extrapolated to use-condition degradation rates through activation energy models such as the Arrhenius equation.

Corrosion and Material Deterioration

Corrosion is a major degradation pathway for metallic components, driven by electrochemical reactions between a material and its environment. In electronic assemblies, corrosion affects solder joints, connector contacts, and metallic traces, increasing contact resistance and eventually causing open-circuit failures. Electrochemical migration, in which metal ions move under an applied electric field in the presence of moisture and contaminants, can produce conductive dendrites between adjacent conductors, leading to leakage currents or shorts.

Polymer and dielectric materials degrade through different mechanisms: ultraviolet exposure causes chain scission and embrittlement in encapsulants; absorbed moisture plasticizes printed circuit board laminates and changes their dimensional and dielectric properties; and thermal oxidation degrades the insulating performance of wire coatings over time. Each of these mechanisms is accelerated by elevated temperature, humidity, or electrical stress, which is why qualification testing protocols specify controlled exposure to these stressors.

Failure Mode and Effects Analysis

Failure mode and effects analysis (FMEA) is a structured methodology for identifying the ways in which a system or component can fail, the effects of each failure mode, and the risk associated with each. Developed initially by the U.S. military in the 1940s, FMEA has become a standard tool in electronics, aerospace, automotive, and industrial product development. The American Society for Quality overview of FMEA methodology describes the process-level and design-level variants, including Process FMEA and Design FMEA (DFMEA).

Risk priority numbers (RPNs), calculated from ratings of severity, occurrence probability, and detectability, help engineering teams focus mitigation effort. The IEEE Xplore paper on using FMEA to increase electronic systems reliability demonstrates how FMEA integrates with design review processes in electronics development programs. When combined with physics-of-failure understanding, FMEA becomes a tool for identifying not just what can fail but the specific degradation mechanisms that drive each failure mode.

Applications

Degradation analysis and management has applications across a wide range of engineering and industrial fields, including:

• Reliability qualification of electronic components and assemblies for aerospace and automotive use
• Remaining useful life prediction for industrial motors, power electronics, and energy storage systems
• End-of-life planning and field failure analysis in consumer and military electronics programs
• Corrosion protection system design for marine, subsea, and outdoor infrastructure
• Predictive maintenance strategies for manufacturing equipment and critical infrastructure