Systems and methods for implementing bulk metallic glass-based macroscale compliant mechanisms
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C22C-045/10
C22C-045/00
C22C-045/06
B21J-005/02
C22C-001/00
B21J-001/00
B26D-001/00
출원번호
US-0942932
(2013-07-16)
등록번호
US-9783877
(2017-10-10)
발명자
/ 주소
Hofmann, Douglas C.
Agnes, Gregory
출원인 / 주소
California Institute of Technology
대리인 / 주소
KPPB LLP
인용정보
피인용 횟수 :
3인용 특허 :
39
초록▼
Systems and methods in accordance with embodiments of the invention implement bulk metallic glass-based macroscale compliant mechanisms. In one embodiment, a bulk metallic glass-based macroscale compliant mechanism includes: a flexible member that is strained during the normal operation of the compl
Systems and methods in accordance with embodiments of the invention implement bulk metallic glass-based macroscale compliant mechanisms. In one embodiment, a bulk metallic glass-based macroscale compliant mechanism includes: a flexible member that is strained during the normal operation of the compliant mechanism; where the flexible member has a thickness of 0.5 mm; where the flexible member comprises a bulk metallic glass-based material; and where the bulk metallic glass-based material can survive a fatigue test that includes 1000 cycles under a bending loading mode at an applied stress to ultimate strength ratio of 0.25.
대표청구항▼
1. A macroscale compliant mechanism comprising: a flexible member that is strained during the operation of the compliant mechanism; wherein the flexible member has a thickness of at least approximately 0.5 mm;wherein the flexible member comprises a bulk metallic glass-based material; andwherein the
1. A macroscale compliant mechanism comprising: a flexible member that is strained during the operation of the compliant mechanism; wherein the flexible member has a thickness of at least approximately 0.5 mm;wherein the flexible member comprises a bulk metallic glass-based material; andwherein the bulk metallic glass-based material can survive a fatigue test that includes 1000 cycles under a bending loading mode at an applied stress to ultimate strength ratio of 0.25; andwherein the flexible member is configured such that its displacement-response to an applied force is nonlinear;wherein the bulk metallic glass-based material is a bulk metallic glass matrix composite;wherein the compliant mechanism is selected from the group consisting of a cutting device, a grasping device, a bistable mechanism, and a rotational hexfoil flexure; and wherein the cutting device comprises: a bladed section with a first and second blade; anda handled section with a first and second handle;wherein the cutting device is configured such that the rotation of the handles towards one another causes the rotation of the blades towards one another;wherein the grasping device comprises: a grasping section with a first and second grasping element; anda handled section with a first and second handle;wherein the grasping device is configured such that the rotation of the handles towards one another causes the rotation of the grasping elements towards one another;wherein the bistable mechanism is configured to be stable in two configurations; andwherein the rotational hexfoil flexure comprises: a base cylindrical portion;an overlaid cylindrical portion; andthree beams;wherein one end of each beam is adjoined to the base cylindrical portion, and the opposite end of each beam is adjoined to the overlaid cylindrical portion;wherein the rotational hexfoil flexure is configured such that the base cylindrical portion and the overlaid cylindrical portion can be rotated relative to one another. 2. The bulk metallic glass-based macroscale compliant mechanism of claim 1, wherein the volume fraction of crystals within the bulk metallic glass matrix composite is between approximately 20% and 80%. 3. The bulk metallic glass-based macroscale compliant mechanism of claim 1, wherein the bulk metallic glass-based material has a yield strain greater than approximately 1.5%. 4. The bulk metallic glass-based macroscale compliant mechanism of claim 2, wherein the bulk metallic glass-based material has a strength to stiffness ratio greater than approximately 2. 5. The bulk metallic glass-based macroscale compliant mechanism of claim 1, wherein the bulk metallic glass-based material is one of: Ti44.3Zr20V12Cu5Be15, Zr39.6Ti33.9Nb7.6Cu6.4Be12.5, Zr56.2Ti13.8Nb5.0Cu6.9Be12.5, Ti31.4Zr36.6Nb7Cu5.9Be19.1, Ti43Zr25Nb7Cu6Be19, and Ti25Zr43Nb7Cu6Be19. 6. The bulk metallic glass-based macroscale compliant mechanism of claim 1, wherein the bulk metallic glass-based macroscale compliant mechanism is a TiZrBeXY alloy, wherein X is an additive that enhances glass forming ability and Y is an additive that enhances toughness. 7. The bulk metallic glass-based macroscale compliant mechanism of claim 6, wherein the bulk metallic glass-based material comprises: Ti in an amount between approximately 10 and 60 atomic %;Zr in an amount between approximately 18 and 60 atomic %; andBe in an amount between approximately 7 and 30 atomic %. 8. The bulk metallic glass-based macroscale compliant mechanism of claim 7, wherein X is one of Fe, Cr, Co, Ni, Cu, Al, B, C, Ag, Si, and mixtures thereof. 9. The bulk metallic glass-based macroscale compliant mechanism of claim 7, wherein: X is one of: C, Si, and B; andX is present in an amount less than approximately 2 atomic %. 10. The bulk metallic glass-based macroscale compliant mechanism of claim 7, wherein: X is one of: Cr, Co, and Fe; andX is present in an amount less than approximately 7 atomic %. 11. The bulk metallic glass-based macroscale compliant mechanism of claim 7, wherein X is Al and is present in an amount less than approximately 7 atomic %. 12. The bulk metallic glass-based macroscale compliant mechanism of claim 7, wherein X is a combination of Cu and Ni, and is present in an amount less than approximately 20 atomic %. 13. The bulk metallic glass-based macroscale compliant mechanism of claim 7, wherein the combination of X and Be is present in an amount less than approximately 30 atomic %. 14. The bulk metallic glass-based macroscale compliant mechanism of claim 13, wherein Y is one of: V, Nb, Ta, Mo, Sn, W, and mixtures thereof. 15. The bulk metallic glass-based macroscale compliant mechanism of claim 14, wherein Y is V and is present in amount less than approximately 15 atomic %. 16. The bulk metallic glass-based macroscale compliant mechanism of claim 14, wherein Y is Nb and is present in an amount between approximately 5 and 15 atomic %. 17. The bulk metallic glass-based macroscale compliant mechanism of claim 14, wherein Y is Ta and is present in an amount less than approximately 10 atomic %. 18. The bulk metallic glass-based macroscale compliant mechanism of claim 14, wherein Y is Mo and is present in an amount less than approximately 5 atomic %. 19. The bulk metallic glass-based macroscale compliant mechanism of claim 14, wherein Y is Sn and is present in an amount less than approximately 2 atomic %. 20. The bulk metallic glass-based macroscale compliant mechanism of claim 1, wherein the bulk metallic glass-based material can survive a fatigue test that includes 1000 cycles under a bending loading mode at an applied stress to ultimate strength ratio of 0.4. 21. A bulk metallic glass-based macroscale compliant mechanism comprising: a flexible member that is strained during the normal operation of the compliant mechanism; wherein the flexible member has a thickness of 0.5 mm;wherein the flexible member comprises a bulk metallic glass-based material; andwherein the bulk metallic glass-based material can survive a fatigue test that includes 1000 cycles under a bending loading mode at an applied stress to ultimate strength ratio of 0.25;wherein the compliant mechanism is a cutting device comprising: a bladed section with a first and second blade; anda handled section with a first and second handle;wherein the cutting device is configured such that the rotation of the handles towards one another causes the rotation of the blades towards one another. 22. A bulk metallic glass-based macroscale compliant mechanism comprising: a flexible member that is strained during the normal operation of the compliant mechanism; wherein the flexible member has a thickness of 0.5 mm;wherein the flexible member comprises a bulk metallic glass-based material; andwherein the bulk metallic glass-based material can survive a fatigue test that includes 1000 cycles under a bending loading mode at an applied stress to ultimate strength ratio of 0.25;wherein the compliant mechanism is a grasping device comprising: a grasping section with a first and second grasping element; anda handled section with a first and second handle;wherein the grasping device is configured such that the rotation of the handles towards one another causes the rotation of the grasping elements towards one another. 23. A bulk metallic glass-based macroscale compliant mechanism comprising: a flexible member that is strained during the normal operation of the compliant mechanism; wherein the flexible member has a thickness of 0.5 mm;wherein the flexible member comprises a bulk metallic glass-based material; andwherein the bulk metallic glass-based material can survive a fatigue test that includes 1000 cycles under a bending loading mode at an applied stress to ultimate strength ratio of 0.25;wherein the compliant mechanism is a rotational hexfoil flexure comprising: a base cylindrical portion;an overlaid cylindrical portion; andthree beams;wherein one end of each beam is adjoined to the base cylindrical portion, and the opposite end of each beam is adjoined to the overlaid cylindrical portion;wherein the rotational hexfoil flexure is configured such that the base cylindrical portion and the overlaid cylindrical portion can be rotated relative to one another.
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