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A method of assembling a structure comprises applying an epoxy composition to at least one of a first member and a second member, sandwiching the epoxy composition between the first and second members, and bonding the two members wherein the adhesive bond is a thermally cured mass. The epoxy composi

A method of assembling a structure comprises applying an epoxy composition to at least one of a first member and a second member, sandwiching the epoxy composition between the first and second members, and bonding the two members wherein the adhesive bond is a thermally cured mass. The epoxy composition contains an epoxy resin, a phenolic or amine compound as a chain extender, a basic catalyst and a polymeric toughener. The composition can be formulated in two parts wherein part A contains the catalyst and part B has the epoxy resin.

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1. A method of assembling a structure comprising:forming a two-part epoxy composition comprising(a) a part A comprising a catalyst and a chain extender, wherein the chain extender comprises a phenolic compound, an amine compound, or a combination thereof; and(b) a part B comprising a reactive epoxy

1. A method of assembling a structure comprising:forming a two-part epoxy composition comprising(a) a part A comprising a catalyst and a chain extender, wherein the chain extender comprises a phenolic compound, an amine compound, or a combination thereof; and(b) a part B comprising a reactive epoxy resin and a polymeric toughener, wherein the epoxy composition has a stoichiometric equivalent ratio of reactive hydrogen sites to reactive epoxy sites of about 0.5 to less than 1.0;applying part A and part B of the epoxy composition to at least one of a first member and a second member(iv)sandwiching the epoxy composition between the first member and the second member; andforming an adhesive bond so as to adhere the first member and the second member together, the adhesive bond comprising a thermally cured mass formed from the epoxy composition. 2. The method of claim 1, wherein the catalyst is a basic catalyst. 3. The method of claim 1, wherein the chain extender comprises a compound having two reactive hydrogens. 4. The method of claim 1, wherein the amine compound comprises a primary mono-amine, a secondary diamine, or a combination thereof. 5. The method of claim 1, wherein the epoxy composition is substantially free of a polyfunctional curing agent. 6. The method of claim 1, wherein the thermally cured mass is cross-linked. 7. The method of claim 1, wherein the first member is a frame member and the second member is a sheet-like member. 8. The method of claim 1, further comprising welding the first member to the second member through the adhesive bond. 9. The method of claim 1, wherein the first member is a frame member and the second member is another frame member. 10. The method of claim 1, wherein the first member and the second member comprises at least a portion of a vehicle. 11. The method of claim 1, wherein the chain extender comprises a dihydroxy phenol. 12. The method of claim 11, wherein the dihydroxy phenol comprises a bisphenol, a dihyroxynaphthalene, or a dihydroxy benzene. 13. The method of claim 11, wherein the dihydroxy phenol is catechol or resorcinol. 14. The method of claim 11, wherein the dihydroxy phenolic comprises catechol, 3-methoxycatechol, 3-methylcatechol, 3-fluorocatechol, 4-methylcatechol, or blends thereof. 15. The method of claim 1, wherein the reactive epoxy resin comprises at least one of an aromatic glycidyl ether epoxy compound and an aliphatic glycidyl ether epoxy compound. 16. The method of claim 1, wherein the catalyst comprises a cyclic amidine. 17. The method of claim 1, wherein the catalyst comprises one or more imidazole compounds and one or more imidazoline compounds. 18. The method of claim 1, wherein Part B further comprises a chain extender. 19. The method of claim 18, wherein the chain extender and the epoxy resin are substantially unreacted before Part A is mixed with Part B. 20. The method of claim 1, wherein the catalyst comprises a cyclic amidine and the chain extender comprises a catechol. 21. The method of claim 1, wherein the catalyst comprises an imidazoline, a 1,4,5,6-tetrahydropyrimidine, or a combination thereof. 22. The method of claim 1, further comprising welding the first member to the second member. 23. A method of assembling a structure comprising:forming an epoxy composition comprising(a) catalyst comprising an imidazoline, a 1,4,5,6-tetrahydropyrimidine, or a combination thereof;(b) a chain extender;(c) a reactive epoxy resin; and(d) a polymeric toughener,wherein the epoxy composition has a stoichiometric equivalent ratio of reactivehydrogen sites to reactive epoxy sites of about 0.5 to less than 1.0;applying the epoxy composition to at least one of a first member and a second membersandwiching the epoxy composition between the first member and the second member; andforming an adhesive bond so as to adhere the first member and the second member together, the adhesive bond comprising a thermally cured mass formed from the epoxy composition. 24. The method of cl aim 23, wherein the chain extender comprises a phenolic compound, an amine compound, or a combination thereof. 25. The method of claim 23, wherein the chain extender comprises a dihydroxy phenol. 26. The method of claim 23, wherein the dihydroxy phenol comprises a bisphenol, a dihyroxynaphthalene, or a dihydroxy benzene. 27. The method of claim 25, wherein the dihydroxy phenol is catechol or resorcinol. 28. The method of claim 25, wherein the dihydroxy phenol comprises catechol, 3-methoxycatechol, 3-methylcatechol, 3-fluorocatechol, 4-methylcatechol, or blends thereof.