How to get started in reliability engineering: a learning guide

Reliability engineering sits between statistics, physics, and the shop floor. Most people arrive from one of those three directions and have to backfill the other two. This guide is a placeholder for the order we would suggest doing that in, and it will be revised as the notebook fills in.

Start with the question

Every reliability problem reduces to one question: how long will this thing work, under these conditions, and how sure are we? Before any test or model, write that question down for a product you know. Name the conditions, name the failure, and name the time. Most of the field is the machinery for answering it.

Probability and life data

Weibull, exponential, and lognormal distributions cover almost every life dataset you will meet. Learn what the shape parameter means physically, how censored data changes a fit, and why a confidence bound matters more than the point estimate. A handful of field returns and a spreadsheet are enough to practice on.

Physics of failure

A distribution describes when things fail. Physics of failure explains why. Thermal cycling fatigue in solder, electromigration, corrosion, and wear each have their own acceleration models. Learn one well, including its assumptions, before collecting the rest. Coffin-Manson for solder joints is a good first choice because the cross-sections are easy to read.

Environments and mission profiles

A test is only as good as the environment it reproduces. Learn how temperature, humidity, vibration, and shock are measured in the field and turned into a schedule a chamber or shaker can run. The mission profile is the document that connects the two, and it deserves more care than it usually gets.

Run a test

Reading stops being useful at some point. Find a chamber, a shaker, or even a hot plate and a logger, pick one small assembly, and run a step-stress on it. Record what you expected before the run and what you saw after. That gap is where the learning is.

What comes next

Later posts in this notebook will go deeper on each section: HALT and HASS, random vibration, thermal vacuum, field reliability, and manufacturing screening. This page will link to them as they are published.