
Muscle wire, also known as shape memory Nitinol, is a nickel-titanium alloy that can flex and contract when heated or an electrical current is applied. The strength of the wire varies with its diameter: larger wires are stronger than smaller ones. The largest wire has over 110 times the strength of the smallest size. When used in the three to five per cent range, muscle wires can run for millions of cycles with consistent performance.
| Characteristics | Values |
|---|---|
| Strength | Varies with diameter; larger wires are stronger than smaller ones |
| Strength range | The largest wire is over 110 times stronger than the smallest |
| Stretch | Can be stretched by up to 8% of their length and will fully recover |
| Optimal stretch range | 3-5% |
| Number of cycles in optimal stretch range | Millions |
| Strength when heated | Shown by the Recovery Weight |
| Strength when cool | Shown by the Deformation Weight; about one-sixth the force exerted when heated |
| Speed of contraction | One-thousandth of a second or less |
| Speed of relaxation | Depends on the conditions surrounding the wire and its size |
| Strength increase | Use two or more wires in parallel |
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What You'll Learn
- Muscle wires can be stretched by up to eight per cent of their length and will fully recover
- The strength of a wire varies with its diameter: larger wires are stronger than smaller ones
- The largest wire is over 110 times stronger than the smallest
- Muscle wires can be used in parallel to increase strength
- Muscle wires contract as fast as they are heated, in one-thousandth of a second or less

Muscle wires can be stretched by up to eight per cent of their length and will fully recover
Muscle wires are made from nickel-titanium alloy, also known as Nitinol. When heated to around 100C, the wire reverts to its austenite form and recovers its previous shape with great force. The strength of a muscle wire varies with its diameter, with larger wires being stronger than smaller ones. The largest wire has over 110 times the strength of the smallest size.
To increase the strength of a muscle wire, two or more wires can be used in parallel. This provides as much strength as needed while maintaining the fast cycle times of smaller wires. Muscle wires contract as fast as they are heated, in one-thousandth of a second or less. To relax, the wire must be cooled, which depends on the conditions surrounding the wire and its size.
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The strength of a wire varies with its diameter: larger wires are stronger than smaller ones
The largest muscle wire has over 110 times the strength of the smallest size, so you can easily match wire strength to your needs. For more strength, use two or more wires in parallel. This gives you as much strength as needed and still keeps the fast cycle times of smaller wires. Muscle wires contract as fast as they are heated – in one-thousandth of a second or less. To relax, the wire must be cooled, which depends on the conditions surrounding the wire and its size.
Muscle wire, also known as shape memory Nitinol, is a nickel-titanium alloy that can flex and contract when a specific amount of heat or current is applied to it. When the wire is in its martensitic form, it can be formed and bent into different shapes. However, when an electrical current of ~1.5A is applied to the wire, or it is heated to ~100C, it reverts to austenite form and recovers its previous shape with great force.
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The largest wire is over 110 times stronger than the smallest
Muscle wire, also known as shape memory Nitinol, is a nickel-titanium alloy that can flex and contract when a specific amount of heat or current is applied to it. When the wire is in its martensitic form, it can be formed and bent into different shapes. However, when an electrical current of ~1.5A is applied to the wire, or it is heated to ~100C, it reverts to austenite form and recovers its previous shape with great force.
The strength of muscle wire varies with diameter, with larger wires being stronger than smaller ones. The largest wire is over 110 times stronger than the smallest. This means that it is easy to match wire strength to your needs. For even more strength, two or more wires can be used in parallel.
Muscle wires can be stretched by up to eight percent of their length and will recover fully, but only for a few cycles. However, when used in the three to five percent range, they can run for millions of cycles with very consistent and reliable performance.
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Muscle wires can be used in parallel to increase strength
Muscle wires, also known as shape memory Nitinol, are nickel-titanium alloy wires that can flex and contract when a specific amount of heat or current is applied to them. The strength of a muscle wire varies with its diameter, with larger wires being stronger than smaller ones. The largest wire has over 110 times the strength of the smallest size.
The strength of a muscle wire when heated is shown by the Recovery Weight, and the amount of force needed to stretch a wire when cool is indicated by the Deformation Weight. When used in the three to five per cent range, muscle wires can run for millions of cycles with consistent performance.
To increase the strength of a muscle wire, two or more wires can be used in parallel. This allows for greater strength while maintaining the fast cycle times of smaller wires. Muscle wires contract as fast as they are heated, which can be in one-thousandth of a second or less.
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Muscle wires contract as fast as they are heated, in one-thousandth of a second or less
Muscle wires, also known as shape memory Nitinol, are a nickel-titanium alloy that can flex and contract when heated or an electrical current is applied. The wires are stronger when heated, and their strength varies with their diameter. The larger the wire, the stronger it is. The strength of a wire when heated is shown by its Recovery Weight.
When a muscle wire is heated to around 100°C, it reverts to its austenite form and recovers its previous shape with great force. The wire's strength in this form is around 110 times greater than when it is in its martensitic form. In its martensitic form, the wire is weaker and can be formed and bent into different shapes.
The strength of a muscle wire can be increased by using two or more wires in parallel. This allows for greater strength while maintaining the fast cycle times of smaller wires.
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Frequently asked questions
Muscle wire strength varies with diameter, with larger wires being stronger than smaller ones. The largest wire has over 110 times the strength of the smallest size.
To increase the strength of muscle wire, use two or more wires in parallel.
The force needed to stretch a wire when cool is about one-sixth of the force exerted when the wire is heated.
The strength of a muscle wire varies with diameter, with larger wires being stronger than smaller ones.
Muscle wire is stronger in its high-temperature form (austenite) than in its low-temperature form (martensitic).











































