import type { PressTonnageInput, PressTonnageResult } from './types.js';
/**
 * Calculate press tonnage for various sheet metal operations.
 *
 * Blanking Force: P = perimeter × thickness × shearStrength
 * Bending Force: P = (K × length × thickness² × tensileStrength) / dieOpening
 * Drawing Force: Siebel formula with friction, bending effects
 * Blank Holder Force: F_bh = π/4 × (D² - d²) × p_bh
 *
 * References:
 * - DIN 8584 (Deep Drawing)
 * - Schuler Metal Forming Handbook
 * - ASM Metals Handbook Vol. 14
 *
 * @param input - Press tonnage input parameters
 * @returns PressTonnageResult with forces, draw analysis, and warnings
 * @throws RangeError if operation is 'combined' but no operations array is provided
 */
export declare function pressTonnage(input: PressTonnageInput): PressTonnageResult;
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