bond_harmonic.txt
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	"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c

	:link(lws,http://lammps.sandia.gov)
	:link(ld,Manual.html)
	:link(lc,Section_commands.html#comm)

	:line

	bond_style harmonic command :h3

	[Syntax:]

	bond_style harmonic :pre

	[Examples:]

	bond_style harmonic
	bond_coeff 5 80.0 1.2 :pre

	[Description:]

	The {harmonic} bond style uses the potential

	:c,image(Eqs/bond_harmonic.jpg)

	where r0 is the equilibrium bond distance. Note that the usual 1/2
	factor is included in K.

	The following coefficients must be defined for each bond type via the
	"bond_coeff"_bond_coeff.html command as in the example above, or in
	the data file or restart files read by the "read_data"_read_data.html
	or "read_restart"_read_restart.html commands:

	K (energy/distance^2)
	r0 (distance) :ul

	[Restrictions:]

	This bond style can only be used if LAMMPS was built with the
	"molecular" package (which it is by default). See the "Making
	LAMMPS"_Section_start.html#2_3 section for more info on packages.

	[Related commands:]

	"bond_coeff"_bond_coeff.html, "delete_bonds"_delete_bonds.html

	[Default:] none