Case Breakdown: A Simple Bracket That Failed Under Load

We recently reviewed a bracket design that looked perfectly fine in CAD — but deformed during testing.

The Original Design

• 2mm steel
• 90° single bend
• Mounted with two bolts
• Supporting a moderate vertical load

On paper, the material strength was sufficient.
In practice, the bracket bent at the corner after repeated loading.

What Went Wrong

1️⃣ The unsupported span was too long
2️⃣ No reinforcing flange was added
3️⃣ The bend radius created a stress concentration
4️⃣ Load direction wasn't aligned with structural geometry

The issue wasn't material strength — it was structural stiffness.

The Fix

• Added a return flange
• Shortened unsupported length
• Adjusted bend orientation to distribute stress
• Slightly increased bend radius

After revision, the bracket passed load testing without increasing thickness.

💬 Discussion:
When designing load-bearing parts, do you increase thickness first, or reinforce the structure?
Have you experienced a similar “looked strong in CAD but failed in reality” moment?