What Is The Difference Between One Way And Two-way Shape Memory?

According to the investigation of Xi'an Zhanwo Research Room, with the in-depth research of nitinol materials, its related products have also developed rapidly. In this issue, let us use nitinol memory springs to talk about the differences between one way shape memory and two-way shape memory.

Nitinol memory springs are divided into one-way memory springs and two-way memory springs.

The One way nitinol memory spring means that it has only one memory deformation. As the name suggests, two-way nitinol memory spring means that it has two memory deformations. One memory deformation can be contraction deformation or extension deformation. The spring with contraction deformation is also called tension spring, and the spring with extension deformation is also called push spring. The springs with two memory deformations can be high temperature extension or low temperature contraction, or high temperature contraction and low temperature extension. These two states have been verified in Zhanwo Laboratory and are objectively existing.

1.) We know that nitinol materials are greatly affected by temperature, and they present different shapes at different temperatures. One-way nitinol memory springs are widely used and can be used in conjunction with springs of other materials, such as the stainless steel springs we often use. Let us take the use case of 60-degree shape memory tension springs and stainless steel springs to specifically talk about one-way memory springs. For example, the tension spring contracts at 60 degrees Celsius, and the set state is tightly arranged. It is used in conjunction with the stainless steel spring to open the valve. When the ambient temperature is below 60 degrees, the valve is closed, and when the ambient temperature is above 60 degrees, the valve is opened. How do they work together? When the ambient temperature reaches 60 degrees Celsius, it will contract to a tightly arranged state. At this time, it will pull the valve open, and the stainless steel spring will also store tension. When the ambient temperature is below 60 degrees Celsius, the nickel-titanium memory spring will no longer contract, and the tension stored in the stainless steel spring will close the valve.

2.) If we use a two-way nitinol memory spring in the same valve opening device, then we don't need a stainless steel spring to cooperate, and the two-way memory spring can independently complete its working principle. How do you say this? For example, we made a two-way nitinol spring that shrinks at 60 degrees Celsius and stretches at 45 degrees Celsius. When the ambient temperature reaches 60 degrees Celsius, it will automatically shrink to open the valve, and when the temperature reaches 45 degrees, it will stretch to completely close the valve. Then someone will ask, what if the temperature is between 45-60 degrees Celsius? What if it is higher than 60 degrees Celsius? What if it is lower than 45 degrees Celsius? With these questions, the conclusion of the research of Zhanwo Studio is as follows: When the temperature is between 45-60 degrees Celsius, it is a process from opening to closing, which changes with the temperature. It remains open when the temperature is higher than 60 degrees Celsius, and remains closed when it is lower than 45 degrees Celsius. At present, the product application areas we provide to customers include: temperature control switches, fire switches, medical device temperature control valves, children's thermos cup valves, elastic insoles, etc.

So how to set the state of the nitinol memory spring? Please pay attention to our previous news or contact amybai2010@zwmet.com or 0086-18161909780 (WhatsApp) at any time, our technical team will provide you with help and answers, thank you.