The impact strength and impact mode that the patio lounge set can withstand are closely related. Different impact modes (such as direction, speed, and concentration) will directly affect the load-bearing capacity and final performance of the chair structure. The following is a detailed introduction of the points:
1. Influence of impact direction
Vertical impact (top-down): For example, when a heavy object falls onto a chair from above, the impact force is concentrated on the chair surface or backrest, mainly testing the weight bearing capacity and material hardness of the chair. If the chair structure is reasonable and the seat surface is sturdy, it can usually withstand large vertical impacts.
Lateral impact: If a chair is hit from the side, it can easily cause tipping or bending deformation of the chair legs and armrests. This type of impact further tests the stability and lateral support structure of the chair.
Diagonal impact: Uneven distribution of force can lead to abnormal stress at the connection point. If the structure is weak, it may cause problems such as loosening and fracture.
2. Is the impact force concentrated
Point impact: The impact force is concentrated in a small area (such as hitting the chair legs with a hammer), which can easily cause local damage or breakage, especially for structures made of plastic or wood materials.
Planar impact: The force acts on a large area (such as a large heavy object pressing on the chair surface), and the force is dispersed, requiring higher overall structural requirements, but generally easier to withstand than point impact.
3. Effects of impact velocity
Slow pressure application (squeezing impact): For example, when placing heavy objects for a long time, although the force is strong, the speed is slow, mainly testing the compressive strength of the material and the stability of the frame. Most chairs can handle this type of compression.
High speed instantaneous impact: If quickly hit, dropped or kicked by heavy objects, it will cause higher stress on the connection and weak parts, which can easily lead to deformation, cracking or breakage.
4. The influence of impact frequency
One time impact: The chair may only experience one sudden impact, but if the structure is good, it can usually withstand it.
Repeated impact: If moved multiple times over a long period of time or subjected to frequent force impacts, it can easily cause loose connecting components, screw slippage, or fatigue of welding points, reducing the overall stability of the chair.
5. Relationship between impact angle and center of gravity
Low angle impact is more prone to rollover: if the impact comes from a lower position (such as a child playing and pushing over), it may directly affect the center of gravity of the chair and cause a rollover accident.
High position impact has stronger conductivity: if the backrest is violently hit, the force will be transmitted along the structure to the bottom. If the design is not reasonable, the bottom connection may be pulled apart.
