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PCB Board FR-4, 2 copper planes vs. Steel AISI 1018
Compare PCB Board FR-4, 2 copper planes vs. Steel AISI 1018 strength, stiffness, weight and thermal properties.
| Try it on a partA sample part to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | not given (tensile used) | 372MPasourceproducer-stated, cold drawn |
| Ultimate tensile strength | 246–385MPasourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction (ASTM D3039) | 441MPasourceproducer-stated, cold drawn |
| Elongation at break | not sourced | 15%sourcein 2 in (50.8 mm) |
| Young's modulus (stiffness) | 21.9–25.8GPasourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction (ASTM D790-15e2); the copper planes are left out | 200GPasourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) |
| Density | not sourced | 7,861kg/m³sourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) |
| Strength to weight | not sourced | 47.3kN·m/kg |
| Stiffness to weight | not sourced | 25.4MN·m/kg |
| Poisson's ratio | 0.171–0.177sourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction | 0.32sourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) |
| Shear modulus | 10.2GPa | 75.7GPa7.45x stiffer in shear |
| Bulk modulus | 12.2GPa | 185GPa |
| Speed of sound | not sourced | 5,043m/s |
| Thermal | ||
| Thermal conductivity | not sourced | 51.9W/m·Ksourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) |
| Thermal expansion | 13–14µm/m·Ksourcethe bare laminate's (fr4-370hr), in-plane X/Y-axis, below Tg (IPC-TM-650 2.4.24C) | 12µm/m·Ksourcebase material: unalloyed carbon steel, Ovako family table (S275JR, 'none alloyed structural steels', C <= 0.21%); mean 20-300 °C |
| 100 mm part over a 50 °C swing | 67.5µm growth | 60µm growth12% less |
| Specific heat | not sourced | 486J/kg·Ksourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) |
| Heats up and cools (diffusivity) | not sourced | 13.6mm²/s |
| Thermal shock resistance | not sourced | 5,473W/m |
| Values for | A whole circuit board read as one orthotropic plate: the JEDEC high-K thermal test board (JESD51-7, "2s2p"), 0.062 in (1.575 mm) thick with two internal solid copper planes 0.0014 in (1 oz) thick, as Texas Instruments SZZA017A Table 1 gives it. Copper C110 and the Isola 370HR laminate from this library; the layers conduct in parallel along the board and in series through it (boardStackup.ts). Its two 0.0028 in trace layers cover little of the board and are left out; vias are ignored. Mechanical values are the bare laminate's. | AISI 1018 cold drawn bar (Niagara LaSalle, cold-finished bar producer) |
Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Is PCB Board FR-4, 2 copper planes stronger than Steel AISI 1018?
Steel AISI 1018 is stronger: its yield strength is 372 MPa against tensile strength 315 MPa for PCB Board FR-4, 2 copper planes (18%).
Which is stiffer, PCB Board FR-4, 2 copper planes or Steel AISI 1018?
Steel AISI 1018 is stiffer: Young's modulus 200 GPa against 23.9 GPa for PCB Board FR-4, 2 copper planes, so the same part in Steel AISI 1018 deflects less under the same load.
Which expands less with temperature?
Steel AISI 1018 expands less: 12 µm/m·K against 13.5 µm/m·K for PCB Board FR-4, 2 copper planes.
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