A device may operate stably for months, yet suffer cracks, broken solder joints, or snapped component leads after being transported. What surprises many engineers is that the vibration amplitude during transport is no greater than usual. The root cause lies in a specific frequency range where the product's structure absorbs energy most intensely, triggering resonance and causing continuous stress concentration at a single point.
Một kiện hàng gần như không bao giờ bị rơi ngay khi vừa rời khỏi nhà máy. Quãng đường hàng trăm kilomet trên xe tải, container hay băng chuyền mới là giai đoạn diễn ra đầu tiên, nơi bao bì liên tục chịu rung lắc trong nhiều giờ. Chỉ sau đó mới đến những cú va chạm khi bốc xếp, giao nhận hoặc rơi ngoài ý muốn.
Many projects encounter a situation where a freshly applied coating looks perfectly uniform and paint consumption matches the estimate, yet additional coating is required during inspection because the thickness is insufficient. This leads many to suspect measurement errors or equipment inaccuracy, whereas the actual cause is a confusion between WFT (Wet Film Thickness) and DFT (Dry Film Thickness)
Many used car buyers often spend a considerable amount of time examining the paintwork, the gaps between body panels, or the overall condition of the exterior. However, these signs can be skillfully masked following repairs; precise color matching and careful polishing can make the vehicle appear almost factory-original.
A fire-retardant coating only provides effective protection when applied to the specified design thickness. A shortfall of even a few hundred microns can significantly reduce fire resistance, whereas an excessively thick coating is prone to cracking and peeling, in addition to increasing material costs
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