硅烷改性聚氨酯密封胶胶筒在约束变形阶段形成的预压紧接触应力

发布时间 : 2026-1-30 17:53:24
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(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.

硅烷改性聚氨酯密封胶胶筒在约束变形阶段形成的预压紧接触应力

(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.

发布时间 : 2026-1-30 17:53:24
Views:

硅烷改性聚氨酯密封胶胶筒的密封属于弹性密封体的自紧式静密封。这种密封依赖于弹性体材料的弹性、不可压缩性和预压紧载荷的存在，而不需要很高的预压紧载荷来防止泄漏。具有初始挤压量并暴露于流体压力的弹性体，就像是具有很高表面张力的液体，保持着预载荷并将流体压力传递给密封接触面。预压紧接触应力总是叠加在流体的压力之上，因此弹体的最大接触压力总是高于流体压力。在桥塞一次坐封过程，坐封工具对桥塞施加一定的轴向坐封力，硅烷改性聚氨酯密封胶胶筒发生弹性变形，逐渐与套管内赔间产生接触。随后，硅烷改性聚氨酯密封胶胶筒发生约束变形，与套管内赔接触并挤压，形成了预压紧接触应力。在压裂过程，也就是在桥塞二次坐封时，压裂流体压力作用于硅烷改性聚氨酯密封胶胶筒的上表面，并促动桥塞，心管对硅烷改性聚氨酯密封胶胶筒施加轴向力。此时，硅烷改性聚氨酯密封胶胶筒处于稳定变形阶段，橡胶将压裂压力传递到接触面上，在叠加预压紧接触应力后，硅烷改性聚氨酯密封胶胶筒接触面的接触应力超过压裂压力，硅烷改性聚氨酯密封胶胶筒便具有了密封性。

根据一义虎克定律，采用拉梅(LamP常数表>的物理方程为阴:式IB为体积应变;A私为拉梅常数，并与杨氏弹性模量E、泊松比。和剪切弹性模量C存在以下关系在约束变形过程由于硅烷改性聚氨酯密封胶胶筒受，心管外赔和套管内赔的共同限制，且硅烷改性聚氨酯密封胶胶筒的硬度远小于其他部分，可以认为硅烷改性聚氨酯密封胶胶筒径向和环向变形为零，即:设坐封工具对桥塞施加的轴向坐封力为F;硅烷改性聚氨酯密封胶胶筒的内半径为R，硅烷改性聚氨酯密封胶胶筒的外半径为R}，套管内半径为R。不考虑轴向摩擦力，坐封力F的作用可以分为两个部分，一部分使硅烷改性聚氨酯密封胶胶筒产生弹性变形，设为轴向坐封力F;另一部分使硅烷改性聚氨酯密封胶胶筒产生约束变形，其产生的面力等于轴向应力。设民:为约束变形阶段的径向应力，则由式(6)得到下式:对使硅烷改性聚氨酯密封胶胶筒产生弹性变形的轴向力，可由式(为求得，可得约束变形阶段的径向应力:不考虑径向摩擦力，径向应力民1等于一次坐封时硅烷改性聚氨酯密封胶胶筒与套管内赔间的接触应力，即预压紧接触应力。http://www.sdyuantai.com/

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