FPC / PCB 工程計算機

FPC 彎折半徑計算器

Static / dynamic bend，估算最小彎曲半徑與銅箔應變。

FPC 彎折半徑計算器怎麼用

FPC 彎折半徑直接影響銅箔疲勞、coverlay 裂紋與客戶裝配可靠度。這個工具用彎折區總厚、銅箔類型與 static / dynamic bend 條件做快速風險判斷。

FPC bend radius affects copper fatigue, coverlay cracking and assembly reliability. Use this calculator to estimate a conservative minimum radius and strain level.

Bend radius and strain

公式: Strain (%) = thickness / (2 x bend radius) x 100

  • Thickness: total thickness of the flex bend area.
  • Bend radius: inside bend radius used in the assembly.
  • Strain: approximate outer-fiber strain before neutral-axis refinement.

公式依據

  • Formula basis: geometric outer-fiber strain estimate for a bent flex section.
  • Engineering note: IPC-2223-style flex design guidance, manufacturer rules and bend testing should be used for final FPC release.

範例

A 0.15 mm flex area with a 1.5 mm target bend radius has an approximate strain of 5%.

輸入欄位

  • Flex thickness
  • Target radius
  • Copper thickness
  • Bend type
  • Copper type

結果輸出

  • Recommended minimum radius
  • Estimated strain
  • Pass / warning indication

工程注意事項

  • RA copper is usually preferred for dynamic bending.
  • Avoid vias, pads, stiffener edges and sharp corners in the bend zone.
  • Dynamic bend applications need cycle testing instead of radius calculation only.

驗證檢查

  • Bend-zone routing
  • Copper strain
  • Stiffener setback
  • Dynamic bend cycle risk

相關製程站

  • 線路設計 - Trace width, spacing, bend-zone routing, differential pair spacing
  • 可靠度驗證 - Bending test, thermal shock, peel strength, solder float, ionic contamination

相關計算器

FAQ

Why does ED copper need more caution?

ED copper is generally less suitable for repeated dynamic flexing than RA copper, so the calculator uses a higher radius multiplier.

Can I place vias in the bend area?

It is normally avoided because plated holes and pads concentrate stress during bending.