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The rectangular specimens with an edge crack were subjected to symmetric three‐point bending and asymmetric four‐point bending to determine the mode I and mode II fracture toughness of the walnut particle and coconut fiber‐reinforced biocomposite. Epoxy resin was used as matrix material and 10 wt% of coconut fiber and 20 wt% of walnut shell particle were used as reinforcing materials. The mode I and...