Plate Deflection Calculator

Fixed Rectangular Concentrated Load

A rectangular plate rigidly fixed around all four edges, loaded with a concentrated force, models a panel welded or continuously bolted into a rigid surrounding frame — such as a machine base plate or structural access panel welded into place — carrying a point load rather than a spread load. Fixing all four edges significantly stiffens the plate compared to simple support, reducing both deflection and, in most cases, centre stress, though it introduces higher stress at the fixed edges themselves.

For the same concentrated load on a plate simply supported at its edges instead, see our Simply Supported Rectangular Concentrated Load calculator.

This calculator calculates the Maximum Deflection and Maximum Stress in a Fixed Edge Rectangular Plate with a Concentrated Load.

Enter your values as required and press SOLVE, your results will be displayed. If you change any unit types or values please press SOLVE again.

CLEAR ALL clears all fields.

MATERIAL: Aluminium 2024-T4Aluminium 6061-T6Aluminium 7075-T3BrassCast IronCopperLeadMagnesiumPhosphur BronzeStainless Steel, 304Stainless Steel, 316Steel, S235Steel, S275Steel, S355Steel, 4130Steel, ASTM A36Steel, ASTM A441Titanium, Grade 2Titanium, Grade 5

THICKNESS: (T)

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WIDTH: (W)

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LENGTH: (L)

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LOAD DIAMETER: (LD)

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LOAD: (P)

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MAXIMUM DEFLECTION: (ym)

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MAXIMUM STRESS: (sm)

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MAXIMUM STRESS L: (sm)

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RELATED PAGES

• Simply Supported Rectangular, Concentrated Load
• Fixed Rectangular, Uniform Load

FREQUENTLY ASKED QUESTIONS

Where should I check stress on a fixed-edge rectangular plate under a point load?

Check both at the load position (typically centre) and along the fixed edges, particularly at the midpoint of the longer edge, where bending moment from a clamped boundary tends to peak — this calculator reports both so you can compare.

How much stiffer is a fixed edge compared to simply supported, for a rectangular plate?

Fixing all four edges typically reduces maximum deflection to roughly a quarter of the simply supported value for the same load and plate, similar to the effect seen on circular and annular plates, though the exact ratio depends on the plate's aspect ratio.